| | Re: Sunsun Canister Filter Opinions
Any restriction can reduce the flow rate through a filter. Even a dirty pump rotor or the bearings, would reduce the flow rate. But, the advertised flow rate should be useful for comparing filters. I don't know what the ideal turnover time is. I have never believed it is a critical parameter. You can always get more water movement in the tank by just using a powerhead. And, I consider that to be more important.