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Thread: Testing after rain - waiting period, or no?

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    Testing after rain - waiting period, or no?

    I'm just wondering if I'll have inaccurate results if I test my water too soon after a rainfall. Yes, I always take my samples from an arm's length depth, so not to test the water that's "on top". I just have a feeling that I'm flying through my first TF-100 kit since opening the pool, and I don't want to waste any of it if I can help it. Thanks for any help.
    1) In-Ground pool with vinyl liner
    - ~25,000 gallons
    - Sand Filter
    - 1 HP pump
    - BBB method working perfectly since 2010
    2) Four Winds Honolulu Spa
    - ~450 gallons
    - 3 step bromine

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Testing after rain - waiting period, or no?

    If your pool was in balance prior to the rain, it will still probably be so.

    Unless the rainwater from the decking runs into your pool istead of away from it, there will be little change

    You can test for your self anytime but you would get the most accurate results If your pump was running at least an hour after the rain so your water was thoroughly mixed.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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