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Thread: keep getting green algae

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    keep getting green algae

    I keep getting algae. cya 50,ph 7.6,alk 90,cal 30. 33000 gal pool,vinyl liner. I keep my cl at 7ppm. At night I raise cl to the top limit of 9 ppm. I use the TF100 pool test kit. The water is crystal clear but there are algae patches on the bottom of the pool and some on the deep end wall slopes. Frustrating to the limit. Don't know what else to do. I follow your advise and no other. Thought about going back to tri chlor and their shock method but I am so happy with the water clarity and no issues with pool equipment and liner longevity which is now 7 years old. Please help me if you can.THANKS

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    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: keep getting green algae

    Sorry to say.....but with 50 are now one of US! Bound to have a niche or some place the little green devils aren't getting slapped good enough. And make sure it's getting brushed enough. But still.on ocassion..bad things still happen to good people as they say.
    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
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    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: keep getting green algae

    Yeah, little buggers hiding somewhere? And double-check water circulation perhaps? Toss a few ping pong balls on the water to make sure you're getting good circulation.

    Have you done a deep clean on your filter recently? Maybe worth a shot.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    In the Industry

    frustratedpoolmom's Avatar
    Join Date
    May 2007
    SWSuburban Chicago, IL

    Re: keep getting green algae

    I had a client with a pool your size with a similar situation when I took over. Depending on your circulation and your pump run time, you can develop "dead spots" where the FC isn't consistent and algae can take hold. I would try routine maintenance doses of Polyquat 60 algaecide as a preventive for this situation.

    Factors at play: bather load, sun exposure, pump run time, adequate circulation in pool. We can expand on the latter 2 if you wish....
    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
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    Diane T.'s Avatar
    Join Date
    Apr 2015

    Re: keep getting green algae

    I don't have any advice, but exactly what I've been going through for the past month. Kept trying to believe it was pollen. I check my numbers at least once a day and brush once or twice a day. I finally did my first SLAM yesterday. Had no chlorine loss overnight, so time will tell. Good luck. Post your results in case I need more help.

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    Swampwoman's Avatar
    Join Date
    Apr 2012
    Grand Rapids, MI

    Re: keep getting green algae

    Greetings. Why not do an OCLT at 10 ppm and see what you read in the morning. A short slam might be in order.

    Also, do you happen to have a robot cleaner? If so, run it right at the same time you add your daily dose of chlorine, which will give extra help distributing mong dead spots. If no robot, you can brush near the suspect areas when you add

    I see youre already rounding up on the cya, whch is also a common cause for mismatch, so I can understand why you're feeling frustrated
    In ground vinyl Grecian, 24k gal, Hayward 220t sand filter, VGreen VSP 165, Hayward SWG, Raypak NG 265k heater, dolphin m4.
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    GET A TEST KIT Chlorine/CYA Chart How to SLAM About Metals & Stains

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