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  1. Trsix

    Piping questions etc

    Have an older house in ground pool, came with a starite filter 70 gpm, oldddd. Picked up a pentair which will flow 100 gpm. Attaching a photo of my current piping. 1. What is the gray valve on the left, small knob on top and can I eliminate it, have turned the knob in the past, doesn't seem to...