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Thread: FC is constant overnight but still visible algae???

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    Join Date
    Jul 2014
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    St. Louis MO
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    FC is constant overnight but still visible algae???

    hello,
    We've been battling algae ever since we upgraded our pool equipment. We knew we might have some minor problems because the pump was off for several days while we plumbed a new pump, sand filter, and liquid chlorinator.
    Sure enough, we had a little bit of green on the bottom of the pool. If you swipe the brush across it, it disappeared. So it must be algae, right? So we shocked the pool. Repeatedly. We've done regular shock and are currently at yellow mustard shock levels. No impact to the algae.
    Here's the kicker. I'm not losing ANY chlorine overnight! And Ive never had ANY combined chlorine, day or night. Not even 0.5. I brush the pool everyday, and now, I have enough algae that it is gathering in small clumps at the bottom of the pool. We've been at it all season, but it just keeps getting worse!
    The algae kicks up a cloud of light green when I brush. It's never turned grey or brown. What am I missing?
    ***edit: we are at 20 ppm CYA. I intend to bring that up, but I figured I would wait until we were done shocking. We've been shocking off and on for 2-3 months now, with no success.***
    15k gal, IG vinyl, 26 yrs old, 1.5hp variable speed pump, sand filter, peristaltic pump (liquid chlorine feeder), dolphin triton (Mr. Roboto), TF-100 + speedstir

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    swoopman's Avatar
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    Re: FC is constant overnight but still visible algae???

    Just to be clear, are you shocking your pool or following the SLAM procedure?
    Pool School - SLAM - Shock Level And Maintain

    Would you post a full set of test results?
    TF-100 Test Kit
    22,000 gallon, 20x40 kidney-shape IG plaster pool built in 1986
    Nautilus NS-36 DE filter, Hayward Self Prime Super Pump 1HP
    Polaris Automatic Pool Cleaner, PB4-60 3/4 HP pump

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    May 2015
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    Bridgewater, NJ
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    Re: FC is constant overnight but still visible algae???

    I'm a new pool owner myself, but what about vacuuming it out (and straight to waste, if possible)?
    Pool Size/Type: 17,500 gallon, 16x40 IG fiberglass; Pump: Hayward Superpump II, 2 HP, 2 Speed; Filter: Hayward C3030 cartridge
    Heater: Hayward H250FDN; Sanitation: Hayward Aquarite w/ T-CELL-9 SWG; Test Kit: Taylor K-2006 // Spa: Hot Spot Rhythm; 355 gallons; CD ozonator; Bromine

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    Jul 2014
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    St. Louis MO
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    Re: FC is constant overnight but still visible algae???

    We are SLAMing, but the only time the FC goes down is during the day.
    Fc =12
    Cc= 0
    Cya=20

    - - - Updated - - -

    Quote Originally Posted by chrismar View Post
    I'm a new pool owner myself, but what about vacuuming it out (and straight to waste, if possible)?
    We actually don't have a manual vacuum. We have a robot vacuum. So there is no option to vacuum to waste.
    15k gal, IG vinyl, 26 yrs old, 1.5hp variable speed pump, sand filter, peristaltic pump (liquid chlorine feeder), dolphin triton (Mr. Roboto), TF-100 + speedstir

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    cowboycasey's Avatar
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    Jul 2013
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    Fletcher, OK
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    Re: FC is constant overnight but still visible algae???

    are you using the fine , 2 micron cartridges in mr roboto
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

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    Re: FC is constant overnight but still visible algae???

    I'm not sure. We are using the cartridges that came with the robot when we bought the house 12 months ago. So there is a good possibility that new cartridges would help. So far, we've only used him to pick up leaves and worms off the bottom of the pool. How often are you supposed to change the cartridges?

    After 2 days at 12ppm, I noticed this morning that there was very little algea growing on the vinyl, but large clumps of algae laying on top of the vinyl in the lower circulation spots. (the crease where the floor slopes into the deep end, the very bottom of the deep end.) Maybe 1 sf Before, I thought that this was just a surge in algae growth, but now I'm thinking it might be dead algae, even if it is still bright green. The hubby is hoome today, so he is going to make sure that we never dip below 12ppm and run Mr. Roboto repeatedly. Maybe we are finally turning a corner...

    I'm still not reading ANY CC, although last night was the first night that the FC dipped overnight (-1.5). So now I'm thinking that my DPD Reagent is bad. I'm having hubby rush order a fresh chlorine kit.
    15k gal, IG vinyl, 26 yrs old, 1.5hp variable speed pump, sand filter, peristaltic pump (liquid chlorine feeder), dolphin triton (Mr. Roboto), TF-100 + speedstir

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    msgtdan's Avatar
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    Re: FC is constant overnight but still visible algae???

    Maybe a dead spot in circulation? Try changing where the returns point.
    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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    pabeader's Avatar
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    Re: FC is constant overnight but still visible algae???

    and brush all over. I mean the pool! three, four, heck as many times as you can.

    maybe try to get a whirlpool going. just to get things good and stirred up.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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