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My qt is 15ton. I did build it this big because my pond is 50ton, with lots of rocks and trees surrounding it. Because of the great weather we have here in the Netherlands (not very cold, but long periods of low temps), I do heat my pond. But this is costing me too much without covering the pond, and this is impossible because of the rocks and trees. Also, I want to have a qt that can give my biggest koi a comfortable home if need be.
The 15ton qt has a aerated bottom drain, a skimmer and three returns. Because I wanted the filter to be ready at all times for use on my qt, and use all the filtering on the qt in the winter, I have designed a flexible system. I have two filter systems, vortex, matting and moving bed, which I can operate using valves, and can either use both systems on the pond, both systems on the qt, or one on the pond and one on the qt. I use double valves in pipes that are connected to both systems, with a t-piece in between that can be drained of water. This way, there will be an area without water, that dries, and thus can not support any bactaria or parasites.
Both pond and qt can be heated. In winter, a polycarbonate tunnel is build on top of the qt.
Rgds
Regenmeneer
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