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Thread: Stains on Blue Fiberglass Pool w/pics

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    Stains on Blue Fiberglass Pool w/pics

    My fiberglass pool has been installed for about 4 months now. I have a SWG and a sand filter. The water is crystal clear and the parameters have been where they are supposed to be. When the weather turned cold, I noticed these two dark blotches on the bottom. I cannot tell if the dark area or the light area is the original color of the pool. I tried the ascorbic acid on both areas with no success. I use municipal water and added the Jacks Purple Stuff when the pool was filled. Has anyone experienced this and what are my options?

    Here is a link to the photos. There is water in the pool.


    Intex donut AG pool, 18X48 (5,593 gallons)
    Cartridge filter and dinky pump that came with pool
    I have no skimmer; for some reason my mother threw it away when she had the pool (?)

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    polyvue's Avatar
    Join Date
    Aug 2009
    Sacramento, California USA

    Re: Stains on Blue Fiberglass Pool w/pics

    14,555 gal in-ground 16'x29' white plaster Pool w/spa (2007); Goldline Aqua Logic AQL-PS-8 control w/Aqua Cell 15 Salt Water Chlorination (SWCG); Hayward TriStar 1HP (1.85 SF) main / 1.5HP (1.60 SF) spa pumps; Hayward Swimclear cart filter C4025, ColorLogic LED lights; Tankless SP-18-4 electric heater; Polaris 280 cleaner.
    View of spiral galaxy in Ursa Major NGC6217 - Hubble Telescope 2009

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Stains on Blue Fiberglass Pool w/pics


    Can you post a full set of test results?

    Why did you use Jack's magic?

    Have you attempted to elevate FC levels to see if the stains start to fade?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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

    Re: Stains on Blue Fiberglass Pool w/pics

    So you are saying this didn't appear until the weather turned cold? That is odd.
    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
    Perfectly Clear Pool Service, Find me on Facebook!

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