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Thread: SWG for spa?

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    Aquatica's Avatar
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    SWG for spa?

    Hi, Just wondering if we can use an swg to chlorinate a spa?

    I'm thinking like a small Goldline T3 cell and run like 1-2 hrs per day might work ok.

    Any chance we can use swg's with spa's?

    Thanks!

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    Re: SWG for spa?

    There are specific saltwater chlorine generator systems for spas such as the ControlOMatic Techniclor or the Nexa® Spa. A regular saltwater chlorine generator for pools will be way too powerful. Every person-hour of soaking in a hot (104ºF) spa requires roughly 1/3rd of an ounce (about 9 grams) of chlorine gas equivalent which is around 7 ppm FC in 350 gallons. The Techniclor puts out 15 grams per day so would be OK for moderate bather load but would fall behind during part of the day (right after the soak) during heavy bather load. Compare that to the pounds per 24 hour ratings of most SWCG units for pools where even the smallest are 1/3 pound (about 150 grams) per day. The PoolPilot AG with low-salt (1000 ppm) RC-11 model puts out 0.21 pounds (100 grams) per day. Also note that most spa chlorine generators use around 1500-2000 ppm salt and not the 3000 ppm usually required for SWCG units designed for pools (the PoolPilot AG with low-salt would be the closest to what would be needed). So after a soak one could run the PoolPilot AG unit for about an hour or two, but in between soaks at 1-2 ppm FC drop per day in a 350 gallon spa you would only run it for around 15-30 minutes.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Aquatica's Avatar
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    Re: SWG for spa?

    Many thanks Chem for that very informative info. So the PoolPilot AG sounds like the way to go. I can adjust filter run time and % output for spa size and usage.

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    Re: SWG for spa?

    Check with AutoPilot to make sure. The user Poolsean on this forum is Sean Assam from AutoPilot and he should be able to confirm which unit would be best to use for a spa, though it does not appear that they specifically market units for that purpose.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Aquatica's Avatar
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    Re: SWG for spa?

    Thanks Chem. will check with Sean.

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