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Thread: Heavy rain and testing numbers

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    kywildcats's Avatar
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    Heavy rain and testing numbers

    How much does heavy rain (2 1/2") in a short period affect the testing numbers? CYA, FC....ect?
    Mark
    20'x28' IG, Vinyl, (Sept 2015) 14,900 Gallon, 3'4 to 5'6 deep, SPLAPOOL 1.5 HP, 220v, 2 speed pump, Waterway Carefree 27" 400 LB Sand filter, Digital Nano plus SWG, TF-100 test kit /speed stir. Dolphin Primal x3 robotic cleaner

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    Texas Splash's Avatar
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    Re: Heavy rain and testing numbers

    Not a whole lot. We got pounded last night and I had to drain some water - about an 1 inch of draining. My levels didn't change a bit. If you had heavy rain for a couple days straight or more and had to drain a lot of water, then you might see some reductions in FC, CYA or CH. pH might get driven up a little with heavy aeration. You might even see a little increase in CC from atmospheric particles that were taken to the water from the rain. But in general, one good rain storm isn't going to throw you off too badly.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Richard320's Avatar
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    Re: Heavy rain and testing numbers

    Figure your average depth is somewhere between 40 and 66 inches. Call it 50 for easy math. 2.5" is only 5% of the total volume. If CYA was 50, it's now 47.5. I doubt you can even see that change on the view tube. If FC was 6, it's now 5.7. You might not even catch that with the drop test.
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    kywildcats's Avatar
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    Re: Heavy rain and testing numbers

    Thanks guys! Still learning everyday.
    Mark
    20'x28' IG, Vinyl, (Sept 2015) 14,900 Gallon, 3'4 to 5'6 deep, SPLAPOOL 1.5 HP, 220v, 2 speed pump, Waterway Carefree 27" 400 LB Sand filter, Digital Nano plus SWG, TF-100 test kit /speed stir. Dolphin Primal x3 robotic cleaner

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    Texas Splash's Avatar
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    Re: Heavy rain and testing numbers

    Richard has that math thing down. My head starts to hurt and I believe actually starts to change shape when I try to think that hard.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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