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Thread: dozens of 1/4" copper color spots in pool steps

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    dozens of 1/4" copper color spots in pool steps

    Hi...first post, have read , and used, information from here for the last two years...still learning.
    20,000 gal vinyl pool 12 years old.
    have a pool heater,
    water:fc 3, ph, 7.6, ta 100, cya 50, ch, 310, , water is clear.
    Live near the beach if that matters. with all the rain lately, the ph sometimes goes down, and have used borax (as suggested on the posts) to raise the ph. works the way it should.
    Here is the problem. a couple of weeks ago, after having used borax one morning, discovered the next day dozens of small 1/4 to 1/8" round, or slightly round, copper colored marks in the fiberglass steps. (I mention the borax, because that's the only occurrence of addl chemicals I can think of different than the usual). I believe I put the borax in the deep end, but may have put it in at the step area as well.
    Living near the beach, (and with 2 grand kids) there always seems to be some sand around the steps. not lots, but some. don't know if there is some interaction chemically there?
    I tried the vitamin c test, no success. (I did notice some metal discoloration near the deep end the week prior, did the stain free, metal out this week, cleared the discoloration in the deep end, nothing to the steps) I also put the stain free right on the steps to add to the pool.
    I have even tried a magic eraser to no avail.
    Help! looks yucky

  2. Back To Top    #2
    Mod Squad Bama Rambler's Avatar
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    Re: dozens of 1/4" copper color spots in pool steps

    Welcome to TFP.

    Can you scratch it off with a fingernail? If you can rub it on a white paper towel and see if it looks green.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: dozens of 1/4" copper color spots in pool steps

    tried to scratch it off. very hard, more of a discoloration in the surface of the fiberglass. than some 'dab' of a substance, what little I could get off onto a towel, no not green...seems the same copper color that is on the pool. ps, I notice there is a bit of sand in the areas where this discoloration is.....dont know if it is connected.

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    Mod Squad Bama Rambler's Avatar
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    Re: dozens of 1/4" copper color spots in pool steps

    It's most likely copper. It can be difficult or impossible to remove. It may be worth your time to buy a stain identification kit.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: dozens of 1/4" copper color spots in pool steps

    Any chance this is lawn fertilizer with iron?
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Re: dozens of 1/4" copper color spots in pool steps

    didnt use any lawn chemicals. though as I mentioned in my other post, live near the beach, sand (and I guess other particulates) seem to end up in the shallow end of the pool.
    Short of just trying to scrape off the area with sand paper, I am at a loss. might that hurt the fiberglass or make it more prone to stains?

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    Join Date
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    Re: dozens of 1/4" copper color spots in pool steps

    Quote Originally Posted by anonapersona
    Any chance this is lawn fertilizer with iron?
    I was wondering that too. Sounded like iron.

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