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Thread: CYA in indoor spa?

  1. Back To Top    #1

    Join Date
    May 2015
    Central Illinois

    CYA in indoor spa?

    I was told by the installer to add 30ppm CYA for my hot tub. It is in a screened room and never sees any sunlight. Is there any other reason they would recommend using CYA in my spa?

    I have very hard water, when changing the water I fill with soft water till 80% full and switch to well water. I was late on the changeover and my CH is only 30. Should I add calcium?


    Viking Maui 2300g fiberglass in ground pool in a screened room with polycarbonate roof. 45gpm pump with sand filter manually chlorinated. Entire pool water can cycle in 51 minutes. Jacuzzi 336g hot tub with ozonator, manually chlorinated. TF 100 test kit with speed stir. Fungi pronounced Fun Guy, I'm Jim

  2. Back To Top    #2
    Isaac-1's Avatar
    Join Date
    May 2010
    SW Louisiana

    Re: CYA in indoor spa?

    Yes, CYA not only protects chlorine from sunlight, but also buffers its action making it less harsh. You should also boost the CYA level every month as it does slowly breakdown with time, this process goes faster in the warm water of a spa (on the order of 5% per month at spa temperatures)
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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