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Thread: at how many PPM can algae NOT grow?

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    at how many PPM can algae NOT grow?

    Every year around this time, I seem to get a whisp of greenish , yellow on the shallow end bottom. My CHL reading right now is 15 and hasnt been below 8ppm this season and i did a drop test with NO DROP Pollen?
    17,000 gal inground
    vinyl
    swg
    3hp 8 returns
    heat siphon heat pump

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    Mod Squad tim5055's Avatar
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    Re: at how many PPM can algae NOT grow?

    How much FC you need to maintain is based on what your CYA level is. Plus, if you get a little growth going you may never eradicate it unless you complete a full SLAM. Have you performed a OCLT to see if you indeed have something living in the water?
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Mod Squad Bama Rambler's Avatar
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    Re: at how many PPM can algae NOT grow?

    Most likely pollen or dust. I think I'd aim one or two of those eight returns toward it if possible and let it keep the place clear.
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    Re: at how many PPM can algae NOT grow?

    Quote Originally Posted by tim5055 View Post
    How much FC you need to maintain is based on what your CYA level is. Plus, if you get a little growth going you may never eradicate it unless you complete a full SLAM. Have you performed a OCLT to see if you indeed have something living in the water?
    i did the OCLT, no drop overnight
    17,000 gal inground
    vinyl
    swg
    3hp 8 returns
    heat siphon heat pump

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    Mod Squad YippeeSkippy's Avatar
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    Re: at how many PPM can algae NOT grow?

    Are you brushing your pool weekly? Its one of the easiest things to forget to do, but it helps enormously.
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Our pool build--> Our Pool Solved Our Sloping Yard Skippy's Cheap Pool Cooler -->Skippy's New Fountain

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    Mod Squad tim5055's Avatar
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    Re: at how many PPM can algae NOT grow?

    Quote Originally Posted by mikeginder View Post
    i did the OCLT, no drop overnight
    well, then if you stay above the minimum on the FC/CYA curt algae is not going to start. Vacuuming or having a cleaner (I have an M5 robot) will keep the dust/ dirt in check. I am amazed how much blows into my pool each week.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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