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Thread: Looking for help with my test readings

  1. Back To Top    #1

    Join Date
    May 2016
    South Dakota

    Looking for help with my test readings

    We bought a house in February with a pool as described in my signature. I found this site after pool store guy opened the pool May 3rd. The water was crystal clear when opened and turned cloudy shortly after. I didn't do any testing prior to his opening because I didn't know squat.

    I still don't know squat, but I think I am learning!

    My chlorine levels have always read very high. I've adjusted the chlorine feeder down expecting to see drops in my chlorine levels, but they've remained fairly stable. It is now set at just under 1 on the dial.

    I used a Taylor K 2006 kit to get the following numbers:

    FC = 10 ppm
    CC = 1 ppm
    pH = 7.0
    Alk = 170 ppm
    CA = >100 ppm

    I drained 6% to 7% of the volume the next day and tested again:

    FC = 7.2 ppm
    CC = 0 ppm
    pH = 7.0
    Alk = 130 ppm
    CA = >100 ppm

    I drained another 6% to 7% of the volume today and will test again tomorrow.

    Does it seem reasonable that my FC numbers would be so high with my chlorine feeder turned down so low and my CYA numbers what they are? From what I have read it seems as though all of my chlorine should be locked up in the CYA and would read low.

    My water temperature ranges around 74 to 76.

    Thank you,
    29k gallon in-ground pool 20' x 40' with vinyl liner
    Sand filter
    Automatic chlorine feeder with 3" pucks
    Pentair gas heater
    Polaris 280

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

    Re: Looking for help with my test readings

    Welcome to TFP!

    The FC test reads all the chlorine including that bound to the CYA.

    You need to replace a lot more water, likely at least 50% and then stop using the tablets which are raising the CYA.
    Jason, TFP Moderator
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  3. Back To Top    #3
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    DFW, TX

    Re: Looking for help with my test readings

    Welcome to TFP!

    Try the extended CYA test diluted with tap water. It could be much higher than 100, even 200 or 300. Directions here, Pool School - Extended Test Kit Directions
    TFP Moderator
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