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Originally Posted by reef_raf
It looks like a lot of people here are trying to supply the tank water movement with their return pump. In fact, the slower the flow thru the sump, the more time the skimmer/heater/etc have to act on the water. You don't want to create 10x your tank volume goig thru your sump!.
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I am going to disagree a little here (rare but yes once and a while it happens) I think you do want between 5 and 10x tank volume through your sump if you ware running the skimmer off you sump. if you only have 1X/hour flowing through your sump and you have a mag 12 on a 33 gal sump you are going to skim that sump aprox 30X per hour (assuming no loss so maybe 15X will be more realistic) but you will only be replacing the water totaly in the sump 1X per hour this will give you an ultra clean water sump and it will seam like your skimmer isn't doing much where as if you have a higher turn over in your sump/tank set up you will ensure more efficient skimming of the actual tank volume.
Steve
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