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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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    In the Industry
    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. - Forum owner
    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

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