ok, so I have been using this return pump for about 2months, everytime after I stop it and do a water change and turn it on again, it shot tons of white things out from the return line.
they don't look like pods
or live things, just like white feather kind of stuff.
its really hard to get a picture, but hope some of you might know what exactly cause this problem.
doesn't matter if I use the prefilter that come with the return pump, those white stuff will still come out when I restart the pump.
do u guys think that might be the stuff from my PVC
Thanks to AMD, HN1, Zero, partypalooza, thincat, and thominil who helped me in almost every questions. Thanks everyone!!!!!