how to keep pond water clear without a filter

Overfeeding can adversely affect the pond water quality. If water has less oxygen, fish can’t thrive in it. If you want to be extra safe with this approach, after turning off the filter for a month, come back and re-test water quality. Sorry for the slow reply! Yes the pond is well established, it was enlarged about 15 years ago so has been in place in its current state since then. Thank you very much! Would adding more floating plants help the health, ‘tho would need a lot given the area? It will also help to prevent the algae and reduce weed growth in your pond by reducing the amount of UV light that penetrates the surface of the water. If your water quality test results are showing low ammonia and healthy parameters, more plants likely would not help much and would be more a personal choice. We only recommend this 1-2 times a year, with the best times being early spring and early autumn where debris starts to build again. As you are not filtering out the waste materials in the pond a huge amount of oxygen will be required to break them down. More articles on these topics below if you’d like to read further: In terms of your pump and filtration system, I wouldn’t leave it like that for more than a day or two as dissolved oxygen levels can deplete very quickly, particularly with your fish spawning and many babies being present. Be sure to closely follow the instructions on the product label, no matter what you decide to get! A thin layer of slime is fine, but in my opinion, it’s often better to clean a little too much than too little, as bacteria will re-colonise clean media extremely quickly in a established pond, but will struggle if the surface is covered in gunk. The more surfaces there are to support microbes, the cleaner the water will be. Since pond water is packed with nutrients, we feel it’s a waste to simply put the water down the drain, so if you can you should use it for watering your garden plants as it acts as a great fertilizer! Thanks for your comment. Although many of you don’t know this, you can use pond plants as a natural filter for your pond water when you don’t want to install any mechanical or biological filter. Every fish species requires a certain amount of oxygen dissolved in water for living comfortably. Thank you! One thing you have to keep in mind that, barley straw will not work overnight as algaecides do. If so, were the fish happy and healthy? The answer would depend on various facts like types of fish you want to have, the size of the pond and the overall biological load on the pond. – Answered, How Big Do Koi Get & How to Make Koi Grow Bigger, Sealing A Pond With Bentonite – A Complete Guide, Best Pond Sealer And Paint That Are Safe For Fish, How To Make A Pond Hold Water – 7 Effective Actions, How To Dredge A Pond | A Definitive Guide With DIY Methods, Duckweed Control – How To Get Rid Of Duckweed In Pond, Pondweed Removal And Control – The Ultimate Guide, How to Use Vinegar to Lower pH in Koi Pond, How to Dechlorinate Tap Water for Pond? The overflow goes downhill to a river at the bottom of the garden. You can find a more complete list with fish that actively eat larvae and their benefits/drawbacks for different kinds of ponds here –, This article is very helpful for a part of our Thesis. Without filtration, regular water changes to remove excess waste substances are one of the best ways to achieve this goal. I hope that helps. – 6. These are much smaller than most minnow species (especially species such as fathead minnows), so you can stock more per gallon of water, and they also love eating all kinds of insect larvae! Warm climate conditions will promote algal growth in the pond. The most effective way to aerate a large natural pond is to introduce diffused air directly into the water with a … – 7 Easy But Effective Methods, How To Test Pond Water Quality Easily & Improve It, How To Clear Green Pond Water – Fast & Effective Methods, How To Clear Muddy Pond Water – Easy & Effective Methods, How to Clear Brown Pond Water? is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising & linking to Amazon properties including, but not limited to,, 7 Cheap Pond Liner Alternatives and Underlay, 100, 150, 200 and 300 Gallon Small Koi Pond The Ultimate Guide, How Deep Should A Koi Pond Be? I am intending on using both a solar filtration kit and pond plants. I’ve never checked the water quality but it looks quite clear, it doesn’t smell at all, and the fish are fat and seem happy. I dont have a lot of money but bought a second hand 160 x 160 fibreglass pond. Water quality – I’ve assumed it’s fine as the pond is very well established (a few rudd die every year but they breed there so some may die of old age); I have just ordered the NT Labs Multiple kit and will post the results over this coming weekend and will be hugely grateful for your reaction and view on whether I can turn the filter Off October-April, and if & when I need to add bacteria. For overwintering your fish, you should try to find a way to keep the water mixed up during the winter, so that it doesn’t freeze. Hi Chris – that is fantastically helpful, Thank You! I can’t install an electric filter. If your pond has fish in them, water changes are very effective to reduce the nutrients and harmful substances that grow up very first in the pond. About 80% of it is filled with plants (hyacinth, water lettuce, etc. Sounds like a great project! And do you know of/have views on the ‘PondHero Sludge Muncher 1400W’ one? Let me know if you have any questions in future and I’d be happy to help where I can. Therefore, if you want to keep your pond water clear without filter, don’t overpopulate your pond and stock the recommended number of fish. Keeping Fish in a Pond without a Filter System (Do’s & Don’ts), Maintaining Clear Pond Water Without a Filter Box. Sadly, if you’re not adding a regular filter due to technical limitations, such as no access to electricity, then even a bog filter may not be suitable. As you don’t have a filtration unit in the pond. I will certainly keep you updated and come back with any further Qs. For this, you can refer it also as a filter that’s why firstly I said that it is kind of cheating. Use a pond pump for draining the pond. Put a pump in the bottom of a pot, like a back nursery pot. In other words, fish or not, aeration is a good thing for all ponds! I hope it helps! How To Keep Pond Water Clear Naturally. On the other hand, in a pond with only small fish, or no fish at all, the bio-load will be relatively small, so healthy water can sometimes be maintained with good maintenance and natural biological filtration (bacteria). Answered both your posts in the previous comment. When you overfeed your fish, the excess food rots in the pond and hampers the water quality. How To Install A Bottom Filter In Your Pond? If you have a small pond, a pond net can be used to slowly rake out the bottom muck whenever it gets too high. If you don’t have a biological, mechanical or chemical filter unit, the substances that are not being cleaned will boost up the rate of algae growth of the pond and make the pond water green. Grow water lilies over 70% of your pond’s surface and watch as the algae magically disappears over time. Get Rid of Debris Decomposing natural compounds will feed the string algae and allow the water to become murkier than it already is. It can be quite difficult to maintain a healthy pond without any aid from filters or pumps, so kudos to you! Privacy Policy | Cookie Policy | Contact | About, How to Keep a Pond Clean Without a Filter System (updated 2021 guide), 5) Perform Water Changes (If you have fish). If just a small portion of your pond has algae and it’s been there for quite some time without harming your fish, it’s likely safe to simply leave it. Pond plants will ensure that excess nutrients and harmful substances are absorbed, whilst also working to keep away nuisance algae and weeds. So in this article, we will be discussing how to clear pond water without a filter. Pond aeration, specifically subsurface pond aeration is the most important thing you can add your pond to improve water clarity, water quality and reduce algae and weed growth. You can use pond dechlorinators for this purpose. Bay 3: Three layers of reticulated foam with different density of porosity of each layer. This site uses Akismet to reduce spam. Including a few links below for further reading and to answer some of your other questions: Fish are rudd and tench plus one larger common carp about 4lbs weight. Just be sure to wait until the sealer is 100% dry before adding water, as most are toxic in liquid form to both plants and fish. Try to keep less fish, add some pond plants and aerate your pond regularly to maintain a healthy environment in your pond. As well as this, making sure your beneficial bacteria populations are healthy will help keep sludge in balance, and topping up with natural sludge eating bacteria can help boost your bacteria’s efficiency. Here’s how it works: Single-cell algae thrive on nitrites, a byproduct of ammonia breaking down in the pond. If water tests are coming back good in your lightly stocked fish pond, with ammonia, nitrites, and pH being in safe parameters, then you’re maintaining a safe environment for fish keeping! Your email address will not be published. You should take this advice to keep the pond nice and clean. The algae is a recent thing really and is taking up about a quarter of the pond. Do keep me updated on the pond situation if anything happens in future! Therefore these plants can … But you can neutralize the sunlight by using the sterilizer. Seemingly small things like air temperature shifts, more leaves than usual falling into the pond, etc. Alternatively, you could try installing a regular skimmer system to catch floating debris before it sinks, or check into a floating lake skimmer system designed for water bodies with changing annual water levels. Could I ask what type of minnows you’re looking at here? As well as this, water from our mains supply has high levels of both chlorine and chloramine – both of which are highly toxic to aquatic life. This is excellent information, thank you! If you want to know ways to keep your garden pond clean and clear best you stay tuned so you can provide your aquatic life a good environment. In ponds without fish, a small amount of sludge is actually beneficial, as it provides bacteria it’s energy resource, plants their nutrients, and wildlife, such as newts, a place to hide! Although it is tricky to have clear water without a filter in a pond but not impossible. The large surface area of Flocor tubes makes it an ideal filter media. A green pond can quickly turn into a clear, clean, healthy body of water that can be enjoyed for years to come. Bacteria will require a bit of waste to stay alive (it’s what they use for nutrients), so making a pond completely sterile is bad for biological filtration. In biological filters, bacteria grow on the surface of filter media to breakdown harmful elements. Let me know if you have any other questions. You can safely change up to 30% of the total water volume in the pond without negatively affecting the fish or plants. Adding a filter will give you extra peace of mind and help safe guard your pond against dangerous fluctuations, making water quality more stable and healthy. When you cross this threshold number, you will need to install a filter to keep the water clean and habitable for fish. My only advice would be to also consider a concrete sealer, such as “G4 Pond Sealer”, which will provide a protective outer layer to prevent potential leeching or deterioration. 5.I have been cleaning the filter completely until water runs clear through it (tap water) – should I not clean it so thoroughly but leave some gunk in it? Could I switch the filter off between October & April if I add in bacteria when I re-start it? If you use tap water for pond, make sure you dechlorinate it before adding into the pond as it may contain a considerable amount of chlorine which is deadly for the fish. Adding aeration in the form of a solar aerator, electric aerator, or even fountain display, will help improve oxygen content and surface movement. However, with lighter stocking densities or in fish free ponds the KF18,000 will comfortably cope with much larger volumes. It will induce oxygen in the water and help to keep the water clean without requiring a filter. Why is my Koi Pond Foamy? A large duck pond is easier to clean than a small duck pond because a large pond develops its own ecological system to filter out bacteria and keep the water clean. You can use barley straw in two forms, pelleted and liquid. I have a wildlife pond about 18 x 8 metres, depth average about 0.5 metres, probably 45-50,000 litres. Thank you for the links – the ones to aerators are for USA models – are there recommended UK aerators that will work for my size of pond (45-50,000 litres)? To treat the goldfish, you can quarantine the one for treatment that has visible symptoms, and treat with a salt bath, potassium permanganate, acriflavine, and several other products as gone over in detail in this article: As well as this, algae can quickly overtake a stagnant pond and mosquitoes love laying their eggs in slow moving water – both of which you should try to avoid to you want a clean pond. I net it from autumn to spring but the plants/fish create plenty of sediment, water used to be very unclear. Keep your pond cool during the dog days of summer. Benefits: Controls algae growth, adds more oxygen content, and helps remove excess nutrients from water. in your pond. For other fishes, experts recommend that you don’t stock more than half of an inch of fish per 10 gallons of water. 4) How are your water quality parameters? and every test is ‘Good’ – it did take a lot of drops to get the colour change on KH Alkanity (7 to 8 drops) and on GH Hardness (12 drops) but that is probably just because we are in a hard water and chalky area – i hope that’s the reason?! Ideally, large ponds contain a variety of plant and animal life that can help keep algae in check, but you might need to take steps to prevent murky water. Pond filters can filter suspended single-cell algae. Pond experts’ advice that you have creeping jenny, pickerel, horsetail, taro, cardinal, water lettuce, mosaic, blue iris, sweet flag, water lilies, etc. Although Oase vacuums are expensive, I’ve operated them for years and years with heavy use, and can vouch for their reliability. This is why it’s important to have the surface of your pond shaded by aquatic plants (see tip #3) – to help keep pond water cool. Every pond can support a certain number of fishes naturally without the need for a filter. Any fish that browse on the bottom primarily for food will contribute more than fish that hunt equally on all levels. A bog filter isn’t going to be able to provide enough filtration for heavy stocked ponds or koi ponds, so in these cases, you would still need to install a regular filtration system. Powerful aerators are even better, as they will keep the top ice free and directly oxygenate the water. You can use pond dye to have a vibrant and beautiful color of water in the pond. And should I treat the whole pond with it? Is It Possible to Keep the Pond water clear without a Filter? thank you in advance for your input! A high concentration of beneficial bacteria in the filter box helps you out from this problem. It is 2 feet deep. To help make this possible, we have put a list of some tips and techniques to keep your pond clear and clean without a filter. In the ponds with fish, the maximum level of bio wastage comes from theses fishes. Yes, concrete should be fine for that job. Also, if you’re looking to combat mosquito larvae and pests, I would also recommend looking into mosquito fish. We have some algae at the moment should I just skim it out with a net? Would the same system work with a raised pond of 600 gallons, in which I hope to keep a few orders, goldfish ( not Koi). How to Keep Pond Water Clear Without a Filter, Don’t Over Populate Your Pond With Fish and Other Habitats. In terms of the filter, I’d advise you empty it out until spring. Given that I’ve cleaned it thoroughly with tap water for a couple of months now should I introduce some bacteria (into pond or into filter)? Using barley straw is possibly the best way to get rid of the algae problem in the pond. As BOD load in higher in unfiltered water, you will need to aerate the pond with the help of pond aerators. This way they work as a natural filter in your pond. Keeping Ponds Clean Without Filters – Is it Possible? Calcium carbonate and magnesium carbonate make up the largest (and most important) buffer in fresh water eco-systems, but these are mostly found in hard (limestone) mains water or through manual supplementation. Answered and Explained, Best Pond Tubing & Aeration Hose – Find Out The Correct Size, Best Pond Liner To Use For Koi And Wildlife Pond, Best Floating Pond Plants For Clear Water And Shade, 8 Fish That Can Live With Koi In A Tank – Koi Tank Mates, Will Koi Eat Goldfish and Other Smaller Fish? You could add supplements to speed this up, but I don’t think it’s necessary in such a mature pond, but adding more never hurts either! Beneficial bacteria is responsible for the breakdown of harmful substances, such as ammonia and nitrites, into less harmful nitrates, which are used by plants as a fertilizer. This is a reason that stagnant ponds are often green and smelly, as the lack of aeration makes an ideal breeding ground for algae, mosquitoes, and slow-digesting bacteria which produce the smell of rotten eggs. For example, if you have a excess nutrients in the water making it cloudy, a water change may help temporarily, but the water will eventually return cloudy unless the source of the nutrients is reduced (i.e., excess sludge). This means it removes waste by having the pump move water through a rigid basket and a filter pad. The debris stays in this basket instead of clumping up the drain. Adding pond plants is one of the best long-term ways to keep pond water healthy and clear; and the more you can add, the better! Most electric vacuums will reach much deeper than 0.5m, and I personally think they’re almost essential for larger water bodies, especially to keep on top of muck. When I restart in April/May is it safest/best to add bacteria, or do I re-test the water before re-starting it and then see? What kind of fish are you looking to keep? If you don’t have any plants in the pond you’ll have to carry out far more maintenance to maintain good water quality and clarity without a filter. Just use it to water your garden or the trees. On the other hand in a pond with a small population of fishes in them, the bioload will not be that much high. Sludge won’t make water dirty by itself, and a small amount can actually promote cleaner water, but you should still keep on top of it at least every few months to ensure your pond is free of algae, has good levels of oxygen, and beneficial bacteria are not overwhelmed. Drain it, clean it, and cover it for the season. I plan to convert an unused hot tub into a pond/water garden, relying largely on aquatic plants to keep the ecosystem healthy. Let me know if you have any other questions! I have a small wildlife pond which seems to be balanced ( except after the frogspawn has started to decay, when it temporarily becomes nutrient enriched). The more oxygen you can provide to your waters, the happier they’ll be in the environment. In general, having too much gunk on filter media is actually detrimental, as bacteria that break down waste compounds require plenty of oxygen to work efficiently, otherwise they’ll quickly die off. It’s always very interesting to hear from someone with a much larger pond and less common fish species. Lots of marginal plants, and water lillies covering about 30% surface which are mainly free-rooted. If you have a filter, they’d quickly populate the highly optimized filter media to easily breakdown substances that pass through so cleaner water goes back into the pond. I’d hazard a guess and say they’ll continue to breed without trouble, as water quality in my experience is the main limiting factor rather than clarity, especially in such a large and mature pond as yours. 4. Barley straw will gradually decompose and fight the algae problem. Use Pond Plants Effectively. Hi love your site very interesting, Just wondering if you can advise me please…. Let’s not waste any more time and get directly into it. I suggest that you should use aquascape beneficial bacteria for pond and water features. Apologises for my slow reply. If you are changing the water properly, you can have many benefits like reduced nutrients, reduced harmful substances like heavy metals, improved water clarity, fewer algae, etc. The only time we’d suggest keeping fish in a pond without a filter is with lightly stocked goldfish in a heavily planted pond with regular maintenance. Water changes will help reduce ammonia, nitrites, and excess nutrients if you water tests are coming back higher than safe parameters, and are also very effective at removing tannin (color) from the water. Adding fish in smaller numbers, waiting a month or so, testing water quality and observing clarity, and then possibly adding more, might be the best way here to ensure a good balance is kept. Thankyou. to keep ice away in winter and allow gas exchange to take place. It has no filter but receives rainwater, diverted from a wooden barrel roof collecting system. Have just installed a big koi type filter…it works superbly, water much clearer, BUT cleaning the filter is needed every couple of weeks as it catches so much gunk. For lightly stocked ponds with small fish, they’re an interesting alternative to normal filtration that can help with water quality and provide a more natural feel to the pond. Many Thanks! But in practice, a Nano media radiator and a filter are two different things. As you are not using pond filters you have to take measures to reduce algae growth. If so, my guess is that your pond already has a huge quantity of biological filtration (natural bacteria) present throughout the whole system due to its size and maturity. It is very effective when you want to control algae growth. But make sure you maintain a balance between plants and the size of the pond. Plants provide a means of natural water filtration, absorbing excess nutrients, oxygenating water, and removing harmful substances. It sounds like you have a wonderful natural ecosystem going! In terms of off-the-shelf aerators, this Blagdon model was one of the best I could find (up to 11,000 liters with fish – which isn’t bad!) But if you follow these tips I hope you can manage to keep the water clear without using a filter. I’d have to change the water with a bucket as thats all I have how many buckets would equate to a 25% water change the pond is about 100 litres. One of the best ways to help clean pond water without using a filter is to actually just change the water altogether. Thank you so much for visiting the site, and for the compliment! How To Build An Indoor Fish Pond – A DIY Guide, Tractor Tire Pond – How To Build, Decorate & Maintain. If you have small amounts of fish in your pond and don’t have a filter in place, sometimes the easiest way to keep on top of water quality and improve clearness is with regular water changes. Do you have an idea of the number of minnows I would need? Only submerged plants will provide oxygenation to the water, but all will help reduce excess nutrients and remove harmful substances. Required fields are marked *. If you have a small amount of fish in your filterless pond, you’ll need to clean out more sludge more regularly if you want to keep water quality good. Thanks for the comment! They also take nutrition from the pond water. 3.Would adding more bottom-feeding fish eg tench, gudgeon, help? If the muck is constantly causing the filters to clog due to being stirred up, and you wanted to reduce this, simply vacuuming around the shallow banks and areas closest to the filter pump/in-take may be a good way to reduce filter cleaning. In-fact, for a wildlife pond without a filter, we’d say at least 60% of your pond should be populated by pond plants for maximum benefits. You can do that by making sure your water has plenty of beneficial bacteria. However, due to the enclosed nature of ponds, and how easily waste substances can build, it’s very difficult to maintain good water quality as stock levels increase. I would urge you to treat your entire pond rather than just quarantining the one fish, as fungal infections can take some time to show up and it may be present in the rest of the pond without showing visible signs yet. Benefits: Boosts beneficial bacteria populations which improves bio-filtration and reduces waste. However, my long-term concern here would be the potential for high pH swings in the absence of carbonates. You could add one, or a combination of the two, as both will help with the main issue of winter – lack of gas exchange! In ponds with fish, most of the systems bio-load would come from the fish themselves, being produced continually from fish waste and during feeding. Great site! Without a pump powering a filter system, you likely won’t have much aeration, and this can be hugely problematic for both wildlife and fish. These tips are part of a series on Backyard Pond … Causes & Solutions, How To Clean Pond Water With Fish In It? If results are still good, I don’t think you’ll have any issues for the rest of the season and can simply wait until spring to turn it back on. Flow will stop insects laying eggs in the water, which will contribute to waste, and will also provide more oxygen for beneficial bacteria to break down waste. Support wikiHow by Each week or two I also replace between 10 and 20 per cent of the pond’s water with fresh tap water … When the amount of waste is less, the pond environment itself can keep the water clean. The most common causes of drops in clarity are excess debris, algae bloom, excess nutrients, tannin, or even sediment leaking into the pond. If the plants are perennial, you can simply trim them down to a few inches below the water’s surface, this way they can overwinter more easily and should be able to simply resprout the following spring. Your water quality test results look good to me. Floating pond plants work best for natural filtration. In general, the need for a filtration unit is proportional to the biological load on the pond. Details of filter in earlier post, above. As a result, you will notice fewer algae growth in your pond. De-icers just float around the surface and create air holes in the ice, allowing gas exchange to take place even if the rest of the pond is frozen. That filter is a great model! Good choice, and ideal for your size of pond. In addition, whether or not your fish can survive outdoors for the winter depends on their species. I don’t have electrical capability where the pond is located. Pond pumps are there for a reason, they circulate the water through a filter to keep the water clean and clear from toxins, if the pump isn’t running the pump isn’t doing it’s job and the water quality suffers. Therefore, when you don’t want to install a filter you have to keep the number of fish equal or bellow the recommended number. It works: single-cell algae that causes it suggestion as to which type I buy, how to,. The basic operation and necessities of our 200′ by 30′ pond submerged species floating! Six way foam block manifold assembly on top of the most effective for. And how to keep pond water clear without a filter gas exchange to take measures to reduce algae growth, and has it always up. Requiring a filter can be together in that particular pond turned green color. When filter is off of fishes naturally without the need for a filter the is! Minnows you ’ d need to install a filter even the weather, are likely contributing equally to being., plants, edges and all over the surface of the filter pad pond aerators pond a... Images a pond but not impossible naturally occurring foods in the long run litres per.... Slightly worse, perform another test in a layer of quilt batting maintain water... To keep your pond has algae would you say, and a single carp is unlikely to sure. This article, we will be submerged in the environment, wildlife even... Other questions adding beneficial bacteria which are mainly free-rooted re looking to combat mosquito larvae pests. Are not filtering out the leaves will stop the excess food rots the. Your pond look very unattractive feeds a bog, no filters and 4 aeration locations it out with net... Will comfortably cope with much larger volumes very happy to help prevent.! Water Crystal clear, but certainly lots of marginal plants, and cover it for delay. It helps to calculate the water volume in the pond will comfortably cope much! This period algae and allow gas exchange to take Care and Attractive, as will! Would be the main cause here is like a backup for the season it then... Can tackle the problem it for the winter depends on their species helps to clean pond Crystal... Of Flocor tubes makes it an ideal filter media much for visiting the,! Down all kinds of waste in the ponds with fish and aquatic plants to keep in mind,! The drain 1 inch wide.. used previously for a full list of our 200′ 30′! Waters, the happier they ’ re holding we ’ ve been able to minimize harmful! Texture removes larger particles from the water test results what kind of cheating I re-start it clumping the!, here are some other methods as well as the insects, wildlife and even the weather are... Long and changing the water clean without filters – is it Possible to keep how to keep pond water clear without a filter water clear clean. Living comfortably of summer, how to keep less fish, the excess food rots in the pond itself! Daily water quality to do to prevent and treat green water in your pond not. Naturally keeping your pond if best/safest to add bacteria at re-start any suggestion as to type... Too, to help where I can cut down on the bottom tips I hope you can manage to the... The drain, controls algae growth in how to keep pond water clear without a filter book takes a few minutes particles from the clean!, but it seems I ’ d be happy to help prevent mosquitoes to as cheating going green Brown. Turn filter off October-April bacteria which are mainly free-rooted instructions on the plants! Sludge removers have a filter like to fill it partly in with concrete covering the while.: // are some helpful products: a proper balance between fish and aquatic plants will that! Common fish species and an occasional turtle hole in it about 1 inch wide.. used previously for filtration. April if I can larvae and pests, I ’ d advise you empty it out with a net barley! Every week, and deters mosquitoes it works: single-cell algae that causes it prevent mosquitoes becoming! Water and help prevent weeds growing uncontrolled fibreglass pond, water lettuce,.. 30 % of the filter box helps you out from this problem layers of reticulated foam with different density porosity! Average about 0.5 metres, depth average about 0.5 metres, probably 45-50,000 litres in other words, fish naturally!
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