Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 14 of 14

Thread: Chalky residue on pool sides

  1. Back To Top    #1

    Chalky residue on pool sides

    Hi,

    I've been using the BBB method all this season and couldn't be happier. I'm puzzled by a chalky residue that covers the sides of my pool. When you rub it, it comes off and floats as small "dust" particles creating a cloudiness in the water. The pool was repainted this past spring, walls are fiberglass and bottom is concrete.

    Any help on identifying what this is and what to do about it would be appreciated.

    Dave
    OzarkMark
    [sub:3gts0njy]Summer Escapes 16'x42" - Sunshine 1600 Sand Filter & Intex Krystal Clear SWG[/sub:3gts0njy]

  2. Back To Top    #2
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,347

    Re: Chalky residue on pool sides

    Probably paint chaulking.

    Post a full set of test results and how you got them.
    Also, what does the water look like?
    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

  3. Back To Top    #3

    Re: Chalky residue on pool sides

    FC 11
    CC 0
    pH 7.5
    T/A 100
    CYA 75
    CH 0

    Water is clear enough to see bottom drain at 8' but I wouldn't call it sparkling.

    FC is coming down from mustard algae shock at 40 due to high CYA.

    I didn't add calcium as i didn't expect leaching.

    Dave
    OzarkMark
    [sub:3gts0njy]Summer Escapes 16'x42" - Sunshine 1600 Sand Filter & Intex Krystal Clear SWG[/sub:3gts0njy]

  4. Back To Top    #4
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,347

    Re: Chalky residue on pool sides

    With fiberglass you need to maintain a certain level of calcium hardness. If your CH is really zero, that will contribute to your problem.
    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

  5. Back To Top    #5

    Re: Chalky residue on pool sides

    Everything has a fresh coat of epoxy paint on it so I thought I was good for a season. I can add calcium but any ideas what the chalky residue is? It was not apparent until recently.
    OzarkMark
    [sub:3gts0njy]Summer Escapes 16'x42" - Sunshine 1600 Sand Filter & Intex Krystal Clear SWG[/sub:3gts0njy]

  6. Back To Top    #6
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,347

    Re: Chalky residue on pool sides

    You say you're coming off shock. Are you sure it's not just dead algae settling out of the water?
    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

  7. Back To Top    #7

    Re: Chalky residue on pool sides

    If you rub your hand on the paint, does it leave any white color on your hand?

  8. Back To Top    #8

    Re: Chalky residue on pool sides

    Definitely!
    OzarkMark
    [sub:3gts0njy]Summer Escapes 16'x42" - Sunshine 1600 Sand Filter & Intex Krystal Clear SWG[/sub:3gts0njy]

  9. Back To Top    #9

    Re: Chalky residue on pool sides

    Epoxy paint used to be good until they changed the formulation to be more "environmentally responsible". However, the result is exactly the opposite. It is now worthless (in my opinion). The new paint just does not work in a pool. The only way to fix it is to sandblast off the paint and recoat with a more durable coating. You might want to contact a fiberglass pool resurfacing company for proposals.

  10. Back To Top    #10

    Re: Chalky residue on pool sides

    I found on another site that if the pool paint is chalking then the total alkalinity is too low and should be raised to 150 or above.

    Anyone see any problems with this?
    OzarkMark
    [sub:3gts0njy]Summer Escapes 16'x42" - Sunshine 1600 Sand Filter & Intex Krystal Clear SWG[/sub:3gts0njy]

  11. Back To Top    #11

    Re: Chalky residue on pool sides

    The primary problem is that the manufacturers removed all of the good solvents in the paint in an effort to reduce the amount of volatile organic solvents (VOCs) released during the drying/curing of the paint.

    The old epoxy would last for years without any trouble. The new epoxy uses water as a solvent, the very stuff your pool is filled with. If a paint says "Low VOCs" or "VOC compliant", then you can be sure that it won't work.

    I don't think it will help much to raise the TA. It might a little, but the high TA is going to cause the ph to continually rise and you will constantly be adding acid to lower the pH, which will lower the TA as well. Then you will add baking soda to raise the TA again and you will end up in a losing battle.

    The only way to keep the pH down while maintaining a high TA is to use carbon dioxide to lower pH.

    Another warning sign of bad paint is the term "easy cleanup". It cleans up easily because it's weak, water-based paint. The label should say something like this:

    This paint is blue; whatever it gets on is going to blue forever. Forget about cleaning it off of anything. Just throw the brushes, rollers and trays away because you're never going to get them clean, ever, seriously.

  12. Back To Top    #12

    Re: Chalky residue on pool sides

    It's good paint-- best available, not water-based. Chalking was apparently caused by "harsh shocking" and low alkalinity. It is recommended that keeping the alkalinity on the high side (175 ppm) helps prevent chalking. Since this is above the troublefreepool recommendation I was asking if I should be concerned about any consequences from maintaining such a high alkalinity.
    OzarkMark
    [sub:3gts0njy]Summer Escapes 16'x42" - Sunshine 1600 Sand Filter & Intex Krystal Clear SWG[/sub:3gts0njy]

  13. Back To Top    #13

    Join Date
    Aug 2010
    Location
    Boston, MA
    Posts
    176

    Re: Chalky residue on pool sides

    James described the highly undesirable consequences - your pH will keep increasing very fast. You will then need to add lots of acid to keep the pH under control. Which will decrease the TA so you have to add even more baking soda.

    I suppose it would be POSSIBLE to maintain TA that high, but it would be a lot of work and consume large amounts of acid and baking soda.
    20k gallon IGP
    Plaster over gunite
    3/4 hp Hayward pump
    Purex Triton DE filter
    TF100 test kit w/ speedstir

  14. Back To Top    #14

    Re: Chalky residue on pool sides

    I have had the same problem with my pool. Painted my plaster pool two years ago with Ultra Poly One Coat. First summer was fine, but second summer a disaster. Water became cloudy from chalking and paint on bottom was coming off on people who were in the pool. We were not able to use the pool for the entire summer season. I did try to resolve this with the company but they were only will to replace the paint, not refund the purchase price. I certainly didn't want anymore of their paint products. Now the pool will have to be sandblasted and replastered.I really thought I had done my homework before purchasing this product but obviously not enough. You will save yourself time and money by not purchasing this product.
    ghgh

Posting Permissions

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