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Thread: Brown spots on bottom of pool.

  1. Back To Top    #1

    Join Date
    Jun 2015
    Pleasant Garden

    Brown spots on bottom of pool.

    Hey new to forum, had pool for 10 plus years.
    About 3 years ago we switched from chlorine to an ionizer system with copper bars and electricity for the sanitizer. I have developed brown spots on the bottom of the pool opposite of the water flowing into the pool.
    I have tried the vitamin c test on the pool bottom and it did nothing to it. I have put a chlorine tablet on the and it lighted the only to come back.
    My numbers are as follows.

    Copper .5 ppm
    p.h. 7.3 ppm
    total alkalinity 110 ppm
    Calcium Hardness 220 ppm
    TDS 2000 ppm

    Please see the attached picture

  2. Back To Top    #2
    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: Brown spots on bottom of pool.

    Welcome to TFP!

    Please add your pool info to your signature as shown here, Pool School - Getting Started

    Your ionizer is adding copper to the pool. Copper above .3ppm will stain the pool and your hair. It also will not sanitize your pool. Here is an article from Pool School - Metals in the Water and Metal Stains
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