04-07-2012, 09:07 AM
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Well the sand filter canister was a bust as the flow rate through it slowed to nearly nothing. I suspect that with time and the slow (3.5gph) pump flow rate, the dense sand packed and if not plugged, severely restricted the flow. I tried a smaller canister with <= half the amount of sand, but after a couple of hours the flow reduced to drops again.
In thinking of what else might work, sponge came to mind, but I don't have enough on hand for that. Pot scrubbers, gravel?
Instead, I filled the canister with polyester fiber floss which should provide a satisfactory platform for beneficial bacteria and serve to polish the water before returning to the tank.
With all of the swapping, one of the siliconed "T" 's in the original canister came loose, so I redid both fittings with the glue gun.