pre-filter in sump and overflow?
I am using eshopps overflow and wonder how many of you who have one use it with the prefilter.
also my return pump has a prefilter as well, and I think it trapped dirty stuff in them and cause my nitrate to stay at 20ppm.
so r the prefilter bad??
I know I have to use it on my return pump to stop little particles get stuck in the pump, but its the overflow pre-filter needed or recommended?
also do I need to wash the U-tube?
Thanks to AMD, HN1, Zero, partypalooza, thincat, and thominil who helped me in almost every questions. Thanks everyone!!!!!