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Thread: Quick question....

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    Quick question....

    Is it possible for a pool that gets sunshine from 7am - 7pm to lose 5 ppm FC in one day just due to sun burn off? CYA is currently at 60.
    12,000 gal Octagon vinyl in-ground pool. Hayward S220 sand filter 3/4 hp pump, heat pump heater

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    Mod Squad jblizzle's Avatar
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    Re: Quick question....

    Depends on how high the FC started, but that does seem a bit high.
    Jason, TFP Moderator
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    Re: Quick question....

    And on what else may be going on besides sunshine!
    Pool size: 24000gal inground Vinyl-Taylor k-2006 and k-1766 test kits and-speed stir
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    Mod Squad woodyp's Avatar
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    Re: Quick question....

    Mine loses 4 and everybody else here seems to think that's high too. But it is what it is. CYA around 50. YMMV.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
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    Re: Quick question....

    I guess the only way to be sure is to run an OCLT to make sure that I am not losing FC to anything else. If that comes back ok.....I guess it is what it is. Does pH gradually creep up? I usually have to add 1/2 gal of 8.25% clorox and some acid to balance out every day. Do these numbers seem within reason or is something sinister going on?
    12,000 gal Octagon vinyl in-ground pool. Hayward S220 sand filter 3/4 hp pump, heat pump heater

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    Mod Squad jblizzle's Avatar
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    Re: Quick question....

    pH tends to creep up. How fast depends on the amount of aeration and your TA level.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    OCLT results are in

    I ran an OCLT test last night and I lost 1.5 ppm of FC. So does this definitely mean that I have something in my water? It went from 10 to 8.5

    Also when the solution goes from light pink to clear, do you count the last drop?
    12,000 gal Octagon vinyl in-ground pool. Hayward S220 sand filter 3/4 hp pump, heat pump heater

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    Smykowski's Avatar
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    Re: OCLT results are in

    Yes and yes. The drop that turns it from pink to clear counts. The next drop where it stays clear doesn't.

    How does your water look?
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
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    frustratedpoolmom's Avatar
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    Re: Quick question....

    You testing the PH after you add the chlorine or before? What sources of aeration are present in your pool?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
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    Re: Quick question....

    Ok I was not counting the last drop, results are unchanged 21 drops last night, 18 drops this morning. 10.5 to 9.0 FC The water looks spectacular, crystal clear. There are always several (30-40) insects (spiders, rolly polly, worms and earwigs) in the bottom of the pool every day. I vacuum them out every other day. Could I be losing FC to those bugs as well? As far as pH is concerned I test before I add chlorine. Very little aeration....one jet that just breaks the surface. I will try and post a pic.
    12,000 gal Octagon vinyl in-ground pool. Hayward S220 sand filter 3/4 hp pump, heat pump heater

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    Re: Quick question....

    12,000 gal Octagon vinyl in-ground pool. Hayward S220 sand filter 3/4 hp pump, heat pump heater

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