Q: Why does my spa drain about half way when my pumps are switched off? My spa is elevated above the pool and serves as the return for the pool. We used it as a spa a week and a half ago and made sure to adjust the suction and return valves back to their original position.
A: There is a Check Valve in-line to prevent the water from flowing out of the raised spa once the pump is switched off. It is this Check Valve that has most likely failed causing the water loss to your spa. Some systems have a Check Eyeball Return Fitting inside the spa that will only allow water to go to the spa when the pump is on. When this fails, gravity takes over and drains the spa water into the pool stopping only when the spa water has reached the same level as your swimming pool.
Most systems have the Check Valve back at the equipment and should be located in the pipe that goes to the spa placed after the valve to turn it from pool to spa on the return side (after the heater). Most are black with a clear lid that you can see through while some older models are grey with a screw on cap.
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