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Thread: Makeup water in return line safe?

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    Makeup water in return line safe?

    Hi guys, this is my first post, been reading the forums for a few months and have received tons of useful information. Thank you!

    Here's my question - I have an indoor pool, about 7800 gallons (22x11). I use a solar cover to cut humidity in half, and to reduce evaporation and retain heat. Works well. But, I do succumb to evaporation, no real way around that.

    I had my plumber install a 24v sprinkler valve. I have several check valves in place. I just want to make sure that I'm safe that no pool water will get back into the home line (don't want to drink chlorinated salt water!)

    Here's the plumbing:

    Skimmer -> Pump -> Pool filter -> Intellichlor IC20 -> Ozone Generator -> Pool heater -> Check value -> return outlet

    The water is being added like this:

    Water supply -> brass check value -> Anti-siphon solenoid value -> pvc check value -> pvc piping tee-d right after check value leaving the pool heater.

    Initially, the water pressure from the pool was forcing water out of the sprinkler valve (Rainbird) diaphragm so I replaced the diaphragm with a solid cap.

    Everything works perfectly, the solenoid kicks on, water fills pool. Solenoid is turned off, a sound of a click on the sprinkler value indicates water shut off. I believe this ok, I'm unable to install a dedicated water line as the pool is indoor and set in solid concrete. I'm concerned I should replace the sprinkler valve with something more industrial, like a simple brass solenoid value. Again, I just don't want pool water entering my main water supply to the house.

    Any feedback, comments or suggestions are welcomed.

    Thanks again everyone,


  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Makeup water in return line safe?

    My auto fill just runs fin the house supply through a brass anti siphon and then the float valve. From your description, sound like you have 3 or 4 valves in place to prevent water from making it from the pool to the host, do I would think you are fine.

    One note, the SWG should be the last thing before returning to the pool so that explosive gas is not trapped in equipment. I certainly would not want that gas going through a heater which could be a source of ignition

    Posted from my Droid with Tapatalk ... sorry if my response is short
    Jason, TFP Moderator
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