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Thread: close but not quite?

  1. Back To Top    #1

    Join Date
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    close but not quite?

    I think I know the answer to this but before I drop another chlorine bomb, I wanted a second opinion
    Had a mild dose of algae on the side of the pool on Wednesday. Brought FC upwards of 14 (it was 14 at 11 p.m. on 6/12), brushed often, left pump running overnight.
    7 a.m. on 6/13 my FC was 13 so I thought I was done.
    Didn't test again until this morning at 10 a.m. and FC is 7.0 ?! (CYA is about 50)/ I realize that the recommended shock level for CYA50 is 20ppm but since the water didn't *look* too bad I was hoping to get the algae out with a slightly lower ppm so we wouldn't have to wait as long to get back in the pool. Am I being ounce-wise and gallon-foolish with the chlorine here and should I just bite the bullet and bring the FC up to 20 for a day (or keep it at 7 for the weekend and then shock it if we want to use the pool this weekend)?

    Thanks!


    pool looks like this -

    View from deep end



    Close up of deep end



    Close up of shallow end

    1950's-era 17K gallon formerly fiberglass, newly replastered IG rectangle (~15x30'),
    Hayward S244S Sand Filter with Franklin Electric 0.75 HP motor and WhisperFlo WFE-3 pump
    Clear ThermaTex bubble cover
    Manual vacuum

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    Re: close but not quite?

    anyone? I'm assuming that a 6ppm drop in FC over a 27-hour period is more than can be attributed to a sunny day's worth of UV's? (BTW what is a "normal" amount of sunny-day UV-related chlorine loss?)
    1950's-era 17K gallon formerly fiberglass, newly replastered IG rectangle (~15x30'),
    Hayward S244S Sand Filter with Franklin Electric 0.75 HP motor and WhisperFlo WFE-3 pump
    Clear ThermaTex bubble cover
    Manual vacuum

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    Richard320's Avatar
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    Re: close but not quite?

    There's three tests to pass before you can say you're done.
    Clear water
    Lose 1 FC or less overnight
    CC less than .5 I don't see that....

    However, losing only 3 ppm per day with low CYA isn't too bad.

    Understand that the pool is like a living thing - you have to feed it every day.

    Also note you can swim up to shock level for your CYA.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: close but not quite?

    Just did the CC test and no CC detected (my R-003 reagent is a bit old though so could that be a false negative?)
    Water is clear although there's a slight haze of dust where I brush.
    1950's-era 17K gallon formerly fiberglass, newly replastered IG rectangle (~15x30'),
    Hayward S244S Sand Filter with Franklin Electric 0.75 HP motor and WhisperFlo WFE-3 pump
    Clear ThermaTex bubble cover
    Manual vacuum

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    Memphis, TN
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    Re: close but not quite?

    if your not swimming today, i would bring it to shock and let it drift down for the weekend and keep it above 7 FC. Like Richard stated, you can swim up to shock level for your CYA
    11,000 gal Fiberglass IG, Jacuzzi sand filter, Pentair Superflo 1.5hp 2speed pump, Hayward AQR15, Maytronics Active20, K-2006 kit, K1766, SpeedStir

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    Re: close but not quite?

    OK bringing FC up - at 15ppm now. So do I try to hold it at around 20 ppm until sundown? Almost seems like overkill when the water *looks* mostly blue and clear but after a few weeks of maybe-it's-gone-maybe-it's-not I'm wanting to get these buggers chlorinated out for sure. Have done a little extra scrubbing around where the vacuum hose connects and around the skimmer and the grout and any other suspected algal hideouts. Fingers crossed.....

    Here's how it looks after another brushing:

    Side view


    Deep end

    1950's-era 17K gallon formerly fiberglass, newly replastered IG rectangle (~15x30'),
    Hayward S244S Sand Filter with Franklin Electric 0.75 HP motor and WhisperFlo WFE-3 pump
    Clear ThermaTex bubble cover
    Manual vacuum

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    msgtdan's Avatar
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    SW MO
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    Re: close but not quite?

    I'd just take a reading after the sun is off it and then see if it's within 1ppm before the sun is on it in the morning.
    Dan D
    Used 2003 Aqua Leader 27'x52", 17,800 w/10" hopper, SwimPro SW256T 250# sand filter, Hayward PowerFlo LX pump 1hp impellor, Emerson 1 1/2 hp motor, setup Aug 2012 Summer 2011 used Summer Escapes Ring pool 14' x 42", Intex 1600gph sand filter, HTH 6 way test kitTF-100 w/stirrer, Well water @ FC=0, PH=7.2, TA=290, CH=320

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    Re: close but not quite?

    FC was 11.5 at 11 pm last night and still 11.5 at 7 am this morning

    FC at 2:30 pm was 8ppm - is that within a "normal" range of FC loss for CYA50?
    Water looks bluer than yesterday, slightly opaque after brushing
    1950's-era 17K gallon formerly fiberglass, newly replastered IG rectangle (~15x30'),
    Hayward S244S Sand Filter with Franklin Electric 0.75 HP motor and WhisperFlo WFE-3 pump
    Clear ThermaTex bubble cover
    Manual vacuum

  9. Back To Top    #9
    UnderWaterVanya's Avatar
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    Mint Hill, NC
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    Re: close but not quite?

    Quote Originally Posted by PoolCleanerMom
    FC was 11.5 at 11 pm last night and still 11.5 at 7 am this morning

    FC at 2:30 pm was 8ppm - is that within a "normal" range of FC loss for CYA50?
    Water looks bluer than yesterday, slightly opaque after brushing
    If not crystal clear keep shocking...

    Sent via Tapatalk...
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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    Richard320's Avatar
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    Re: close but not quite?

    Quote Originally Posted by PoolCleanerMom
    FC was 11.5 at 11 pm last night and still 11.5 at 7 am this morning

    FC at 2:30 pm was 8ppm - is that within a "normal" range of FC loss for CYA50?
    Water looks bluer than yesterday, slightly opaque after brushing
    It might be time to re-read that article on how to shock your pool.

    Sound sto me like maybe all that's left is a good brushing to get all the fine gunk in suspension so the filter can grab it and maybe pool-school/add_de_to_a_sand_filter

    Ask the neighbors who have a pool. If someone has a DE filter, they probably have a big bag of the stuff, and all you need is like an empty margarine tub's worth.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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