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You can do this two ways. the BEST way is set up a separate filter system and gravity flow a 4" line from the skimmer to the filter. Then run a 2" suction line from the skimmer's filter to the pump. You can tie in your bottom drain filter and your skimmer filter to the same pump and use ball valves on each line to regulate the flow. Or....you can use a 2" line in the skimmer wall and suck the water from it at pretty much any rate you want. I personally would prefer the gravity fed line to a separate filter, but space sometimes does not permit that. I have a 2" shower drain in my skimmer box. Make sure you keep the screen on the shower drain. Or even better, attach some other strainer thingy to the line inside the skimmer box. Since it is a suction line, things tend to get stuck to it (like frogs....don't ask...it was disgusting) and it needs to be cleaned off pretty often.
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