Farmer brown's aquaponics: floating raft system – floating raft system. water pumped from the sump to the raft system travels through a matala pond filter to remove suspended solids prior to entering the raft system. water exiting the raft system and the gravel grow beds, returns to the sump.. Very fine solids drop out of the water as the water passes slowly through the raft tank depositing on the bottom in a layer about 6mm (1/4") deep. this material accumulates to this depth over about a 6 month period. the main filter system does not catch all the very fine material and this accumulates in the bottom of the rafts..
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