it's for that extra layer of filtering(the net) and the water needs to settle in that tank to build up enough pressure to distribute water evenly for those four whole pipes. The return tank balances the two return flows of water making overflow more controllable.
it's for that extra layer of filtering(the net) and the water needs settle in that tank to get enough pressure to distribute water evenly for those four whole pipes.
Dante Alvarado hi, I used porous expanded clay balls. These are porous with lots of crevices suitable for bacteria growth. If you are referring to the first solid filter, it is basically a set up that uses flow pressure differences to force solid particles to the bottom of the Filter
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