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In my best singing voice-- " and away go troubles, down the drain"----
A drain is the heart of any good pond system. Or should I say the 'mouth'?
Not only does the drain give a place for the waste to be efficiently and effectively removed from the main pond to sumps and vortexes, it also mixes the water in a pond and helps mix layers of water and reduce 'dead zones' in the pond. Some metabolites have a tendency to seek a height in the water column. Midwater and surface water for instance, tend to collect different pollutants. A drain will keep all water moving towards the filters. And at the same time, areation from the dome or from independent airstones will move water in the opposite direction. Skimmers will add yet another directional flow. Its all good. JR
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