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Thread: How high can chlorine be when I close pool?

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    How high can chlorine be when I close pool?

    I will be using a solid cover, and CYA is around 60... Can I close with chlorine at or above shock values?

    I've been running chlorine at/above shock levels for the last few days in preparation for pool closing this weekend, but I've just realized that since the water is much cooler, and sun isn't shining as long, I'm still gonna be at shock level come Saturday/Sunday. Will that be ok, or do I need to wait for FC to drop to avoid a bleached liner next spring?
    25,000 gallon 18x36 vinyl inground, sand filter, been doing this a few years now and feel like I have a decent handle on it.

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    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: How high can chlorine be when I close pool?

    You'll be fine. The suggested shock value takes a liner pool into consideration so you will have no unwanted effects.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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