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Thread: algae in salt water pool

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    algae in salt water pool

    I just converted my chlorine pool to salt water. It was sparkling clear and now it has algae in it. I tested my water last night and here are the readings: Th 400, FC 5/10, Ph (lower than 6.4), TA (lower than 240), CYA 150, Salt 5650 ppm. I don't even know where to begin to remedy this problem. And I am hoping to have my pool ready for the Memorial Day holiday
    1) 13500 Gallons
    2) Sand Filter
    3) AG (24 FT, Circle, 4 Feet Deep)
    5) If you know, tell us the size pump and the size (flow rate) of your filter.

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    dmanb2b's Avatar
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    Re: algae in salt water pool

    welcome to TFP Mozie ...your PH is too low!!! Please raise it to 7.2 using borax (yup...20 mule team found in the grocery laudry isle)...your CYA is too high (need to lower to 70-80ppm by partial drain and fill) and is keeping the chlorine that is in your pool inactive ...btw a saltwater pool is a chlorine pool. You are now just using a SWG to convert salt to chlorine using electricity.

    My suggestion is to read pool school (button on upper right of this page) and order a test kit such as the tf100 from tftestkits.net or the taylor k2006...you'll see testkits discussed in pool school, but they are crucial to pool management.

    Once you have a full set of test results and lower your CYA...we'll get you on the road to recovery
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

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    Mod Squad Bama Rambler's Avatar
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    Re: algae in salt water pool

    ^ What dmanb2b said ^!
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Melt In The Sun's Avatar
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    Re: algae in salt water pool

    Is your SWG generating chlorine? 5650 ppm seems too high, unless you're in Australia or using one of their SWGs. I speculate your pool has no chlorine because you (or someone else) put in way too much salt and the SWG shut itself off.

    sounds like a partial drain (about 50%?) and refill is in order, assuming all your numbers are correct. That will bring down salt and CYA (way too high at 150; could be much higher in reality).
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

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    Re: algae in salt water pool

    Quote Originally Posted by Melt In The Sun
    Is your SWG generating chlorine? 5650 ppm seems too high, unless you're in Australia or using one of their SWGs. I speculate your pool has no chlorine because you (or someone else) put in way too much salt and the SWG shut itself off.

    sounds like a partial drain (about 50%?) and refill is in order, assuming all your numbers are correct. That will bring down salt and CYA (way too high at 150; could be much higher in reality).
    I think I will try this step before I try raising any of the other levels. I probably did add to much salt. Didn't realize that the SWG would shut off. I am very new at all of this.
    1) 13500 Gallons
    2) Sand Filter
    3) AG (24 FT, Circle, 4 Feet Deep)
    5) If you know, tell us the size pump and the size (flow rate) of your filter.

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    Melt In The Sun's Avatar
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    Re: algae in salt water pool

    Sounds like you've got a good plan. Pretty soon you'll be a pro!
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

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    frustratedpoolmom's Avatar
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    Re: algae in salt water pool

    What are you testing with?

    I'm in total agreement, iF your CYA is really 150 you need to drain at least 50% of the water and start over with rebalancing the chems. When you go to rebalance, begin with PH and TA.

    If you trust the test results, do the partial drain/refill and then post back with updated test results.
    No point in trying to balance your other levels if you end up just draining it out.

    (tip of the day: a saltwater pool is a chlorine pool. )
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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