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On the pool I take care of, before the pump (suction side) there is a large 3 position valve. To the left is bottom drain, middle is all 3 and to the right is the 2 skimmer baskets. You will have to check to see which one controls which on your pool but is simple to check, turn all the way one way and stick your hand into one of the skimmer baskets and feel for suction.

Answ:: Most newer pools have a "valve assy." of sorts at the bottom of the skimmer. It is either made of plastic or brass. This rotates in one direction to either increase or decrease the suction at the skimmer. It really does not totally shut off the main drain.

Other type skimmers have a system that uses a "float valve" at the bottom of the skimmer. Removing this unit from the skimmer will reveal two holes at the bottom of the skimmer. Looking down into the skimmer from the deck side of the pool ~ the hole closest to you would be the direct link to the pump. This is the port in which you would connect the vac hose. The other one is connected to the main drain and all go back to the pump from the bottom of the skimmer. The "float's" purpose is to prevent the skimmer from sucking air in the event the water level got too low. It has a floating stopper inside.

If your set up has only one port at the bottom of the skimmer then you most likely have a brass or PVC valve situated just before the pump inlet. Sometimes there are multiple valves and are usually not marked as to what they control. You just have to work with a partner to find out which one does what and where.

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Q: How do you turn on and use the floor drain to filter and isolate the skimmer filters?
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