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Thread: Cloudiness at lower FC, clorine consumption

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    Join Date
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    Cloudiness at lower FC, clorine consumption

    Hi Everyone,

    recently our pool water has given us trouble - was not an issue for the last 5 years that we have had the pool.

    Issue: Even at 100% output, the SWG is not keeping up with the chlorine consumption. (We replaced the cell last year.)

    Water became cloudy, FC to 1.0, so I shocked with bleach. Got it up to 12PPM FC - 0 CC and held it for 5 days- water cleared up again.

    FC dropped from 10.0 to 1 in a week. Water became cloudy again. Yesterday I shocked it again to 8-10PPM, and it is clearing up again.

    Water temp - around 75-78 deg these days.

    CYA: 70PPM-ish
    TA 70 PMM
    CH - 210 ppm
    PH I manage it to stay around 7.4 - adjusted with Muriatic Acid as needed
    Salt: 2700ppm

    At the return nearest the pool, we see offgassing of CO2 proportionally to the level of the SWG we set. It bubbles away happily. So I would deduce the SWG works well but I can't measure it directly.

    Built 5 years ago
    25K GAL inground, Quartz surface
    Jandy Aquapure - replaced cell last year
    Solar heat
    Brand new 425SF cartriges in filter .
    Location - NJ

    I see no evidence of algae - so what could be the source of chlorine consumption? We had lots of rain (>6 inches) in the last weeks But I don'1 think that's an issue.

    The use is light - mostly my kids and I and we are trained in pool hygiene )

    So any ideas what might be wrong?

    We're tempted to drain and refill (which we haven;t ever done in five years) but I'd like to avoid the trouble.

    Thanks!

    Patrick
    Completed July 2008: 25,000 gal IG gunite, 3M "Smoke" Quartz, 6' sheer descent w/ fiberoptic light bar, 2 Hayward ColorLogic LED lights, IntelliFlo VF (running at 160 watts to filter - yeah !), Jandy PDA PS8, Jandy Aquapure 1400 SWCG (running at 15% :o) ), 8 "Jet Flow" returns, 450 sq ft Hayward cartridge filter, 480 sq ft HelioCol solar panels, Hayward VacAlert, Hayward Phantom Turbo, BBB method, TF-100 Test kit (of course !)

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    Mod Squad woodyp's Avatar
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    Re: Cloudiness at lower FC, clorine consumption

    pool-school/chlorine_cya_chart_shock

    Your shock value for FC with that level of CYa is 28 to 30. 10 or 12 ain't gonna get you there!
    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
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

  3. Back To Top    #3

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    Re: Cloudiness at lower FC, clorine consumption

    Thanks - so is there invisible algae somewhere? The water looks fine and there is no hint of green - the water just gets cloudy/milky at low FC ...

    So should I just shock to 20-30 PPM FC to kill the buggers? The chlorine vendors will love me!
    Completed July 2008: 25,000 gal IG gunite, 3M "Smoke" Quartz, 6' sheer descent w/ fiberoptic light bar, 2 Hayward ColorLogic LED lights, IntelliFlo VF (running at 160 watts to filter - yeah !), Jandy PDA PS8, Jandy Aquapure 1400 SWCG (running at 15% :o) ), 8 "Jet Flow" returns, 450 sq ft Hayward cartridge filter, 480 sq ft HelioCol solar panels, Hayward VacAlert, Hayward Phantom Turbo, BBB method, TF-100 Test kit (of course !)

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    Mod Squad woodyp's Avatar
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    Re: Cloudiness at lower FC, clorine consumption

    NO!.......you should shock at 28-30! You gave no listing for your CC level. I suspect that's where your problem lies. SOMETHIING is definitely eating that FC.
    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
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

  5. Back To Top    #5

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    Re: Cloudiness at lower FC, clorine consumption

    So cloudiness = algae? I was wondering if that might be something else ... some other chemical reaction ...
    Completed July 2008: 25,000 gal IG gunite, 3M "Smoke" Quartz, 6' sheer descent w/ fiberoptic light bar, 2 Hayward ColorLogic LED lights, IntelliFlo VF (running at 160 watts to filter - yeah !), Jandy PDA PS8, Jandy Aquapure 1400 SWCG (running at 15% :o) ), 8 "Jet Flow" returns, 450 sq ft Hayward cartridge filter, 480 sq ft HelioCol solar panels, Hayward VacAlert, Hayward Phantom Turbo, BBB method, TF-100 Test kit (of course !)

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    Re: Cloudiness at lower FC, clorine consumption

    You shock when any of the following occur:

    1) Water is not clear (you're wasn't, it's cloudy)
    2) CC > .5
    3) OCLT > 1
    <unwritten> you let FC get below minimum

    Your water is not clear and you let FC get well below minimum for your CYA. Time to follow the shock process. Don't ever let FC get below minimum (which is 3 for you at CYA 70, if you're closer to 80 then it's 4) or you'll likely have to go through the shock process again. It doesn't take long if your FC is low for algae to grow even though you can't see it. It can take hold in a day at low FC. That your SWG can't keep up with what's consuming FC at your normal settings is a dead give away of something growing in the water.

    My guess is it will only take a few days to knock out what you've got by following the shock process. When you upped your FC to elevated levels (but not SHOCK levels) you knocked the algae down, but you didn't knock it out completely. Shocking properly totally eliminates it.

    -edit-
    Re-read your post again. Don't shock to "20-30", maintain 28 and don't let it drop below 28. Sometimes this can mean adding bleach every other hour or so to maintain.
    18x36 inground vinyl lined, Hayward sand filter and tablet chrolinator, approx 18k gallon

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    Re: Cloudiness at lower FC, clorine consumption

    Great - thank you! I guess I didn't kill all the organics the first time around. I'll get them this time and make sure I'll include the OCLT as well.
    Completed July 2008: 25,000 gal IG gunite, 3M "Smoke" Quartz, 6' sheer descent w/ fiberoptic light bar, 2 Hayward ColorLogic LED lights, IntelliFlo VF (running at 160 watts to filter - yeah !), Jandy PDA PS8, Jandy Aquapure 1400 SWCG (running at 15% :o) ), 8 "Jet Flow" returns, 450 sq ft Hayward cartridge filter, 480 sq ft HelioCol solar panels, Hayward VacAlert, Hayward Phantom Turbo, BBB method, TF-100 Test kit (of course !)

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