I just purchased a system that came with a sump full of Bio Balls. I have them soaking in 50/50 bleach solution right now to clean them up while I re-due the sump walls and baffles and was wondering if I should use them in this new system? Don't hear much about them and I have searched on here for some threads but only found a couple that didn't answer very many questions. Are they a chemical trap like a canister filter gets or are they good with filtation??
Any insight on this would be greatly appricated.