how many times a hour should the water go through the sump?

[mr.wilson]

Originally Posted by banditpowdercoat

Exactly. But, one does have to consider tank flow if it's enough to maintian detritus in suspension so the low sump flow can take it. Most have that taken care of no problem. Some, however use sump flow as a contributor to overal tank turnover. If you don't get the crud from the tank to the sump, it doesnt matter what flow the sump/skimmer has.

Absolutely. We are going under the assumption that the display tank water is moved by powerheads or a closed loop pump, as it should be for efficiency. using sump turnover ratios to increase flow in the tank makes no more sense than pumping water through your light fixture for more flow.

Some people try to do a one-pump-fits-all system, but you will find this is a false economy. save money on your return pump and use the savings to build a closed loop or add powerheads.