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

[StirCrazy]

Originally Posted by Mr OM

The opening post asked about sump turnover,not tank turnover. whether you like it or not if you have an overflow box you do have a prefilter box they are technically doing the same thing, why are people saying as I said years ago that having no teeth in the oveflow box is more effective? why because it skims better.

no teath yes will take the surface water a bit better, not a lot, but the big advantage is it is quiet and less air in the overflow so you get better flow.

Steve