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Here is a picture of my setup. Both valves are set to pool. (Suction, return). When this is set there are little bubbles in the pump, when I turn the suction valve to spa (or even halfway) the bubbles stop. The black pump is inactive and the breaker is shut off.

Bought a new home with a pool. The spa sometimes will drain into pool when pump turns off and de will go into spa and pool. When pump is running bubbles will appear in pump basket when suction is on the pool side, but when I turn the valve to the spa side the bubbles stop. Could this be a...