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I did replace the black check valve in the picture recently. If I leave the spa return on 100%, it will drain the spa as well.

I have a spa that spills over into the pool. I want about 20% of my return water going to the spa to chlorinate the spa and produce a nice waterfall; thus 80% of the return back to the pool. When I shut off the pump, the spa drains down to the water level of the pool. I can hear the water...