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The plants grow in rock-filled grow beds that drain and fill every 15 minutes. There is no soil involved, and the rock beds act as biofilters. They not only remove solid waste, but the bacteria living on the surface of the wet rock also convert ammonia from the fish waste into nitrates that the plants can use.
In other words, the fish waste provides nutrients for the plants, and the plants help to clean the water for the fish. It is a closed-loop system that is both efficient and sustainable
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