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Thread: Gotchas with a partial drain and refill of a vinyl lined pool?

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    Gotchas with a partial drain and refill of a vinyl lined pool?

    CYA levels are still high, about 105. I'm thinking about doing a partial drain and refill. Most people say to drain halfway and fill, but I've also heard that you need to be careful about how much you drain an inground vinyl pool. Are there any pointers I should take into account here?
    28,000 gallon
    inground
    vinyl
    DE filter

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    duraleigh's Avatar
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    Apr 2007
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    Re: Gotchas with a partial drain and refill of a vinyl lined pool?

    Draining halfway is safe and should get your CYA down around 50 which is fine.

    If you want to be super careful, draining 1/3 is safer but you may have to drain again since your CYA would then be about 70......a little too high for a non-SWG pool
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Isaac-1's Avatar
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    May 2010
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    Re: Gotchas with a partial drain and refill of a vinyl lined pool?

    Always leave at least a foot of water over the floor of a vinyl liner pool to keep the liner from lifting and wrinkling. Remember in most pools 50% of the water will still likely leave this much in the shallow end.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
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