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Thread: manganese and iron stains on fiberglass float tank

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    manganese and iron stains on fiberglass float tank

    In a 8ft dia float tank made of fiberglass we get brown stains above the waterline I think they are iron and especially manganese oxides mixed or transported there with body oils from the floaters. Will ascorbic acid work on manganese or maybe oxalic acid? Or maybe some other reducing agent? Acid cleaning (vinegar) has been ineffective but it removes body fats.

    float tank construction fiberglass
    solution 90%saturated epsom salt, releative density 1.25
    disinfection by hydrogen peroxide dosing after every session
    pH 7.2
    TA 80ppm
    CH 0
    CYA 0
    FC 0
    TC 0
    note waterline rises siginficantly with two floaters in the pool.
    below waterline, no problem.
    into float tanks, (not spas or swimming)

  2. Back To Top    #2
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    SWSuburban Chicago, IL

    Re: manganese and iron stains on fiberglass float tank

    You can try a vitamin C tablet on the stains to see if it lifts, if it does then you can follow the Absorbic Acid Treatment instructions.
    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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