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Thread: Losing Chlorine Level

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    Join Date
    May 2015
    South Bend, Indiana

    Losing Chlorine Level

    We have a 20'x40'x10' in-ground with a vinyl liner (liner is 6 years old). We have treated for phosphates on a weekly basis and recently tested for ammonia that registered 3ppm.. Shocked the pool with 24lbs of burnout (granular) and removed the ammonia, however, we had no chlorine level within fifteen minutes and had more phosphates than previously. Had the water retested (within two hours of the first test) and put another 16lbs (granular) of shock in the pool after the test. Chlorine held for one hour at very high levels when tested with the test strips. Fourteen hours later and 3" of rain we are once again at 0 chlorine reading on the test strips. Pool filter is operating as usual and the sand was changed one year ago. Any suggestions?

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Losing Chlorine Level

    Welcome to TFP!!!

    Phosphate are meaningless ... well lowering them does one thing ... siphon funds from your pocket to the pool stores profit.

    You need to invest in one of the Recommended Test Kits and stay away from the pool store that keep selling you this garbage.

    Until you have meaningful test results, there is not much we can suggest.

    Have you discovered Pool School yet? Start with these:
    ABCs of Water Chemistry
    Recommended Pool Chemicals
    How to Chlorinate Your Pool
    Jason, TFP Moderator
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    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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  3. Back To Top    #3
    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Columbia, SC

    Re: Losing Chlorine Level

    Welcome to TFP!!

    I would recomend staying out of the pool store as they are going to cause you to go broke selling you magic that doesn't work. Your solution is chlorine, probably lots of it.

    You are going to need to SLAM your pool. A SLAM is a continuous process of adding chlorine to a pool multiple times a day over multiple days until the pool is completely clear/clean, not a one time addition of chlorine. Additionally, you should be using liquid chlorine; (8.25% bleach or 10/12.5% chlorinating liquid). Solid forms of chlorine are adding things you may not need to your pool.

    To effectively practice the TFPC methods and conduct the SLAM, the FAS/DPD chlorine test is essential. The kits sold at the pool store generally won't won't cut it, but be careful pool store employees are known to say “it's the same thing”. Generally it's not! Order a TF100 and at least include the XL option. That will give you what you need while you are clearing the pool, and probably enough reagents for a couple of years normal use.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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