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Thread: algae in new SWG pool

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    algae in new SWG pool

    I'm a total newbie to this site and to my new gunnite pool that has a new salt generator system.

    The builders, who have also provided basic service up to this point, have told me to just add muriatic acid daily ( 1/3 of a jug) and no shock now that the salt generator is up and running. Actually it's been running for a couple of weeks. Soon after the SWG was installed I started to notice some algae on the pool walls and especially the walls in the spa part ( both are white plaster). The tech came by and added about a half a bottle of algacide and things were good for a coupla weeks. I brush the pool faithfully but after the last heavy rain the algae is coming back. The water is crystal clear but I'm paranoid about damaging the pool so the only thing I've done is tonite I put in a pound of powdered/granulated(?) shock. I was shutting off the filter for about 6-8 hrs nightly after midnite about the time the algae started appearing.

    I welcome any and all suggestions. Thanks

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    In the Industry
    Nasty90's Avatar
    Join Date
    Apr 2008

    Re: algae in new SWG pool

    Hello, welcome to the site. I think the salt system shouldn't be used untill the gunnite surface cures for at least thirty days.
    35000 in ground vinyl liner with cartridge filter

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    Re: algae in new SWG pool

    The pool was 2 mos. old before the salt system went online. Thanks

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    launboy's Avatar
    Join Date
    Jun 2008
    S.E. Wisconsin

    Re: algae in new SWG pool

    What are your numbers, mainly FC, CC, PH and CYA. Generally for salt pools the CYA is kept between 60-80, but you should check your manuals because it might say differently. The SWG might not be maintaining enough FC to keep algae at bay. You should shock with bleach until the algae is gone. Once your sure no more algae is growing, adjust the output on you SWG to maintain thew FC level, generally 2-4 ppm.

    For sure though, post a full set of test results so people can hel you with more accurate advice.

    18' x 42" Intex Easyset Pool, with 16' x 52" deep end in the middle. Approx. 5500 Gal.
    Hayward Power-Flo LX 1 HP, 100# Jacuzzi Brand Sand Filter(Piped underground so it looks nice) 8)
    3 - 2' x 20' Solar Pool Heater Panels(roof mounted)
    Goin' on 9 summers...NOBODY thought it would last this long.
    Buried Portable Spa sharing pumps and water with pool (Almost complete project)

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: algae in new SWG pool

    A SWG is not very good at killing algae once you already have algae. So you will need to shock the pool manually. However, there is probably some other issue with your water chemistry that allowed you to get algae in the first place. If you post your numbers we can give more specific advice.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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