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You run the pool filter through the main drain by moving your valve next to your pool pump to main drain only. This is usually a Jandy Value or the like.

Usually there are three positions on this value. One for both main drain and skimmers. One for skimmers only and one for main drain only.

As a precautionary warning. Only adjust this value with the Pump OFF. Doing it while the pump is running may cause significant damage to the value. No one needs additional pool repairs if it can be avoided.

Hope this helps. : )

The above answer is only good if there is a dedicated main drain line to the pump. Most pools in California have the main drain line connected to the front port of the skimmer and use a diverter valve in the bottom to regulate the ratio of bottom or skimmer suction. Jandy and Ortega valves are both designed to be adjusted with the pump running with no fear of damage. Multiport valves should only be adjusted with the pump off.

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