Question about Water Pik Aqualink Rs4 Package - Pool and Spa Combo

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Why does the spa empty when the pump shuts off? just got a pool with an aqualink RS4 and no manual to look at. thanks

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This problem can be caused by a couple things. the two most likely culprtits are either the absence of check valves and or incorrect actuator settings when the pump shuts down.

Your spa is most likely higher than the pool. You most likely have a spill over (waterfall) feature from the spa into the pool. This is so the spa water can be recirculated in pool mode. One of your actuator valves may be slightly off closed position in order to allow spill over in the spa, or you may have a dedicated overfill pipe in the circuit to feed water to spa in pool mode.

Whichever spill over piping you have set up, when the pump shuts down, water from the spa ( higher level than the pool) will backfeed through the overflow spa circuit, back through the pump and into the pool through either drain or return. Effectively rendering your spa level the same level as your pool.

To fix this problem, simply install check valves into the spa runs and as a secondary measure put one into the pool return run ( the run that feeds water to pool).

This will insure that when the pump shuts down, no matter which position the valve actuators may be set, water can not back feed through the pump circuit from spa to pool.

Posted on Aug 23, 2009

  • Louie Reale Jun 07, 2013

    Can you send me a diagram showing where check valves need to be. I have a pool self cleaning spa above pool. It has been emptying into pool . I replaced check valve guts and still doing same thing . I think my actuator is at fault going past its setting. Please advise Thanks' Louie

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