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Thread: Avoiding Iron Staining

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    Avoiding Iron Staining

    I read somewhere that if iron staining is an issue that it is better to add borax and baking soda through the skimmer instead of broadcasting it in the pool. Is that true? If so, should the SWG and heater be turned off to avoid damage? Also, which products are considered the best metal sequestrants?

    Thanks for your help!!
    East TN
    13,000 gal San Juan Fiberglass Pool;SWG; GoldLine Pro Logic Controls
    Hayward Sand Filter; Hayward Max-Flo XL Pump;Polaris 380; Hayward ColorLogic LED
    Raypak Gas Heater

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    frustratedpoolmom's Avatar
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    Re: Avoiding Iron Staining

    You can add predissolve it and pour it slowly in front of the return and then brush with a pole combo - you don't want it clumping and sitting on the bottom... the best sequesterants are Jacks Magic, Proteam Metal Magic, GLB Sequa Sol to name a few... they are HEDP based...(look for DEDP, Phosphonic acid derivative, or phosphonates on the label). Maintaining your CH at 250-300 is also a good preventative for staining on fiberglass.
    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
    http://www.PerfectlyClearPoolService.com

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    JasonLion's Avatar
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    Re: Avoiding Iron Staining

    Adding through the skimmer means the stains are inside the filter, instead of on the pool. That has advantages and disadvantages. In very extreme cases, quite rare really, it might damage the filter.
    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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    Re: Avoiding Iron Staining

    Thanks for your help. I don't want to risk damaging the filter, but I hate the staining!! In the past, I broadcast it throughout the pool. I will try pouring it in front of the returns.
    East TN
    13,000 gal San Juan Fiberglass Pool;SWG; GoldLine Pro Logic Controls
    Hayward Sand Filter; Hayward Max-Flo XL Pump;Polaris 380; Hayward ColorLogic LED
    Raypak Gas Heater

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    JasonLion's Avatar
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    May 2007
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    Re: Avoiding Iron Staining

    The key is to pour slowly while the pump is running. The return jet mixes it with a lot of pool water quickly, minimizing the temporary PH increase before it mixes throughly.
    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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