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Thread: CYA test readings

  1. Back To Top    #1

    Join Date
    Jul 2013
    Waxahachie, Tx.

    CYA test readings

    I know this has been covered a million times and I have read almost every post on the subject. Since the readings are subjective at best I just got back in town. My wife been doing an amazing job with the pool and testing.
    Her last CYA test was 60, 2 days ago. I tested this morning, bright full sun. At 60 and the dot starts disappearing, at 40 its no longer visible. What number should I go by?
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  2. Back To Top    #2

    Join Date
    May 2014
    Current: Singapore Previous: Clayton, Victoria, Australia

    Re: CYA test readings

    Sounds like 40. You want the dot to completely disappear.
    Also, it is best taken with back to sun (bright indirect sunlight).

  3. Back To Top    #3

    Join Date
    Apr 2014
    Sugar Land, Texas, United States

    Re: CYA test readings

    I am having the same debate so I decided to use my kids as 2nd opinion. I tested the CYA indoor and when I have doubt, I would ask the kids because sometime your concentrate on the dot stays on your brains even it is not there.
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  4. Back To Top    #4
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: CYA test readings

    You should not do the test indoors. It should be outside in bright indirect light. Usually with the tube at your waist.

    You can get the CYA standard solution from which is 50ppm and then experiment with what light is right for you.
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