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In article , Harry Ziman
wrote: We are about to install a large pond in our garden. We don't intend to keep fish in it, but do want to keep the water clear. The advice we have received is that we need a UV clarifier to prevent algae formation but, as there will be no fish, there is no need for a filter to go with it. The algae will clump together and settle to the bottom. However, looking here, it seems to suggest that a filter is needed - does anyone have any experience and if so can you let us know. I don't want to make an expensive mistake and install the wrong system. Fish are only one cause of dirty water. Other contributors include wildlife, plants (rotting organic matter), grass clippings, silt, etc. The first prophylactic measure must be to site the pond in the right place - preferaably sheltered so that debris doesn't get blown into it and definitely in partial shade since sunlight is the main catalyst for the growth of algae. You should also plant some oxygenating plants and possibly also introduce oxygen to the water by installing a fountain and/or waterfall to break up the surface. Then you should install both a UVC and a filtration system (or a combination unit). And since filters are sited outside the pond, you must choose between a box-type filter which you will have to hide somewhere or a pressurised filter which you can mostly bury out of sight beside the pond. Most filters incorporate both mechanical filtration (via layers of foam) and biological filtration (a colony of beneficial bacteria which attacks the harmful bacteria). Since you are understandably worried about wasting money, you should take advice from one of the big manufacturers such as Hozelock Cyprio - http://www.hozelock.com/aquatics/I029.asp?region=ROW - who will give you a money-back guarantee if their recommended system fails to give you clear water. I recommend their Helpline - 01844 292002 - and suggest that you give them a call, armed with the dimensions of your pond. |
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