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Thread: Chlorine Lock? Draining pool only option?

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    BigDave's Avatar
    BigDave is offline Lifetime Member Whizbang Spinner BigDave 3 stars BigDave 3 stars BigDave 3 stars
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    Default Re: Chlorine Lock? Draining pool only option?

    I see your post.

    There's no such thing as chlorine lock but your CYA is very high. I'd guess as a result of use of tablets. You can run a pool with high CYA, there has been some discussion on this subject here on the forum. Have you read through Ben's Best Guess Chart?

    Another note: We don't put much stock in pool store chemistry test - there's alot of reasons but suffice it to say that they are often misleading. We recommend the Taylor K-2006 kit for reliable testing.
    12'x24' oval 7.7K gal AG vinyl pool; ; Hayward S270T sand filter; Hayward EcoStar SP3400VSP pump; hrs; K-2006; PF:16

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    Default Re: Chlorine Lock? Draining pool only option?

    Without a DPD drop-count chlorine test, like the Taylor K2006, you will not be able to manage the appropriate chlorine levels for a CYA = 195 (or anything in that range).

    Also, the 2006 has relatively accurate CYA testing -- still not VERY accurate, but test strips are TERRIBLE for measuring CYA, even when read electronically. If you actually have CYA = 195, you'll have to drain 75% just to get down to a CYA = 50 ppm.

    Get some polyquat -- it will get the pool from turning green, and get a K2006. Test your CYA with it, and then decide what to do.

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