need find cheap (or free) good filter medium for my 436 Gallon filter
I just build a my filter box 40''x42x 60''(with plywood,treated
lumber,simpson ties etc) for my 6000 Gallon pond, need a lot of medium
to fill the filter, my budget is very tight now, please advice on any
good CHEAP medium ( I believe I need both machanic & bio filter
medium). thanks in advance
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