Quote:
Originally Posted by alprazo
I my big tank I have about 2" of river pebbles that range from 1/4 to 3/4 inch stones. Then I have about 1/2 of sand. I have an upflow return in the bed using 1.5 inch pvc. The stone covers the pipe grid.
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Does this function similar to a plenum or reverse undergravel filter?
Sounds interesting!