+ Reply to Thread
Results 1 to 2 of 2

Thread: How to remove yellow stain at the bottom of the pool

  1. #1
    Join Date
    May 2012
    Location
    San Jose, CA
    Posts
    1

    Default How to remove yellow stain at the bottom of the pool

    Here's some information of my pool
    * 24,000 gal
    * concrete with plaster
    * cartridge filter
    * 1&1/4 hp pump

    There are some yellow stain at the bottom of my pool and I am not sure what causes it. I've try to shock the pool and use the brush to brush it. Nothing works. Can any shed some light? Thanks!

    Regards,
    Andrew

  2. #2
    PoolDoc's Avatar
    PoolDoc is offline Administrator Quark Inspector PoolDoc 5 stars PoolDoc 5 stars PoolDoc 5 stars PoolDoc 5 stars PoolDoc 5 stars PoolDoc 5 stars PoolDoc 5 stars
    Join Date
    Jan 2005
    Location
    Georgia
    Posts
    11,386

    Default Re: How to remove yellow stain at the bottom of the pool

    Sounds like mustard algae. If it brushes away, and then returns in a day, it IS mustard algae.

    Do this:

    1. Read the Best Guess page in my sig; to eradicate mustard algae you have to hold chlorine to the higher shock level.
    2. See if you can find this kit http://www.walmart.com/ip/HTH-6-Way-Test-Kit/17043668 in your area. If you can, test your CYA level.
    3. Failing that, get a cheap OTO / phenol red kit.
    4. Until you know more about your pool's chemical levels, run your chlorine 2x higher than whatever you have been running.
    5. Read the test kit info page; order a K-2006
    6. One option to make it easier to control mustard algae is to use borates at 50+ ppm. That's a lot of 20 Mule Team Borax, which is only 11% effective borates. But, it's something you can do quickly, if you want so

+ Reply to Thread

Similar Threads

  1. Yellow stain on steps from chlorine tablets
    By Chuppet in forum Pool Chemicals & Pool Water Problems
    Replies: 5
    Last Post: 06-21-2012, 10:22 PM
  2. Stain on Pool Bottom
    By danas831 in forum Dealing with Stains & Metals, . . . and 'Minerals' & 'Ions',
    Replies: 2
    Last Post: 06-12-2012, 11:29 PM
  3. Yellow stain in inground pool
    By howbout in forum Dealing with Stains & Metals, . . . and 'Minerals' & 'Ions',
    Replies: 2
    Last Post: 07-31-2007, 04:15 PM
  4. fiberglass, slight yellow whole pool stain/coating
    By jonnygib in forum Dealing with Stains & Metals, . . . and 'Minerals' & 'Ions',
    Replies: 19
    Last Post: 06-17-2007, 08:42 AM
  5. brown stains along rim of pool, vitamin c does not remove stain, idea?
    By vinouspleasure in forum Dealing with Stains & Metals, . . . and 'Minerals' & 'Ions',
    Replies: 13
    Last Post: 07-27-2006, 01:22 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts