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Thread: Gunite discoloration

  1. Back To Top    #1

    Join Date
    May 2010
    Location
    Dallas TX
    Posts
    181

    Gunite discoloration

    What is this discoloration and should I do anything about it?





    Ignore the debris on top - I'm talking about the splotchy discoloration

    Facts:

    I've had the pool 5yrs
    Gunite is 8-10yrs old
    I'm pretty sure p.o. had issues with low pH (some grout corrosion around tiles evident) and high pH after converting to SWG (scaling on the tiles when we moved in!)
    I have strictly maintained the pool chemistry according to "Water Balance for SWG's" since ownership.
    For the first year I ran the pool at slightly negative CSI to remove the scaling from the tiles.

    The discoloration is visible only in indirect light - had to wait for an overcast day to be able to photograph. It's been more or less this way since we've owned it. Is it scaling?

    I am lead to think it's scaling from p.o. as the pool cleaner wheels have left 'tracks' on the wall at the point it climbs so far, and no farther; and the wheels spin against the gunite.

    Input welcome, thanks!!
    33k Gunite, CompuPool CPSC48 SWG, Sta-Rite System 3 DE, 2.25hp dual-speed, POOLVERGNUEGEN Pressure-side

  2. Back To Top    #2

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    May 2010
    Location
    Dallas TX
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    Re: Gunite discoloration

    anyone??
    33k Gunite, CompuPool CPSC48 SWG, Sta-Rite System 3 DE, 2.25hp dual-speed, POOLVERGNUEGEN Pressure-side

  3. Back To Top    #3

    Join Date
    Jul 2014
    Location
    Berks County, PA
    Posts
    206

    Re: Gunite discoloration

    Hmmm...not sure what that might be. Does it feel smooth? If it's scale, it'll be sharp and rough. Also, I don't recall that scale is all that visible. You know you have it though when you step on it. Mine was like walking on needles. If you can see scale, it should be a whitish color. I'd be inclined to take a wire brush to it and see what happens. Your plaster is not that old yet and so it shouldn't be wearing through to the gunite. I'm thinking what you have is some sort of staining that took place at some point. Is it white or painted plaster? Worst case scenario is that the pool was not well taken care of and that the plaster is wearing out before it really should be.
    12,000 gal. Anthony IG pool; 3 ft. shallow end to 6 ft. deep end; Built 1989; Renovated July 2014 using a 10-part unexposed quartz plaster aggregate of 3 S-grade Blue, 3 S-grade Gray, 2 T-grade Blue, 2 T-grade Gray; Apollo VA-52 DE Filter; Hayward SP-2607X10 Super Pump 1-HP Single Speed; Jandy AE-Ti Heat Pump; Taylor K-2006 Test Kit

  4. Back To Top    #4

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    May 2010
    Location
    Dallas TX
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    181

    Re: Gunite discoloration

    It is very smooth. it is white plaster, not painted. It is difficult or impossible to 'feel' the difference between the 2 colors. In fact, you can only really see it on a cloudy day.
    I think it's been this way for a long time, I've just gotten pickier and notice it more
    Sounds like it is not a major issue and may be nothing I can do about it!
    33k Gunite, CompuPool CPSC48 SWG, Sta-Rite System 3 DE, 2.25hp dual-speed, POOLVERGNUEGEN Pressure-side

  5. Back To Top    #5

    Join Date
    Jul 2014
    Location
    Berks County, PA
    Posts
    206

    Re: Gunite discoloration

    As long as there is nothing going on with the gunite that is showing through, it probably is just some sort of flaw or stain or whatever in the plaster. As my plaster got older, several places wore right through to the gunite, but those were obvious holes and pits. Since you say you can't feel any difference, it probably is some sort of stain. Have you tried one of those large "erasers" that they sell at pool stores that hooks to the end of a pole (the same way a brush or net attaches)? I'd probably try it and see if it rubs out any of that discoloration. That, plus, as I mentioned, wire brushing. If nothing helps, some day when it is time to replaster it'll all be gone! I looked at stains left from metals in the water (when we initially filled the new pool) for over 20 years. Now that we had everything redone it is so nice that finally they are no longer there.
    12,000 gal. Anthony IG pool; 3 ft. shallow end to 6 ft. deep end; Built 1989; Renovated July 2014 using a 10-part unexposed quartz plaster aggregate of 3 S-grade Blue, 3 S-grade Gray, 2 T-grade Blue, 2 T-grade Gray; Apollo VA-52 DE Filter; Hayward SP-2607X10 Super Pump 1-HP Single Speed; Jandy AE-Ti Heat Pump; Taylor K-2006 Test Kit

  6. Back To Top    #6

    Join Date
    Jan 2014
    Location
    LA County
    Posts
    5

    Re: Gunite discoloration

    Mine's even worse. I started getting the discoloration (& black algae) about 2 years after it being done (5 yrs ago). My previous 35 yr old plaster looked way better. I attribute it to crappy installation (I should have known not to use a company called Craypo). My pool has used significant amounts of acid compared to the old plaster, so perhaps they are related.

  7. Back To Top    #7

    Join Date
    May 2014
    Location
    Houston, TX
    Posts
    155

    Re: Gunite discoloration

    That looks like gray mottling. I have the same problem, and it was on a new plaster/pool, so I went back to the pool builder to ask them to fix it. Check out my thread in this section "gray mottling problem".

    Unfortunately, this cannot be fixed unless you replaster. You can have perfect water chemistry or even do an acid wash, and you'll still have gray mottling because of the way the plaster was installed.

    It sounds like you inherited this pool... you said it's 8-10 years old, but you had it only 5 years? If I were you, I would budget for a replaster and pull the trigger when you are ready. Plaster is already 10 years old, so a replaster looks within a few years in your future as long as you have this pool.
    IG gunite pool size: 12,500 gallons - includes spa with spillover, Polaris vacuum cleaner, Ultrapure Ozonator, inline tab chlorinator that I no longer use
    Filter: Hayward Swimclear Model #4030, 4-Cartridge Filters
    Pump: Century, 2 HP with a Hayward 6060 booster pump
    Date of build: March-April 2014 *NEW* : Test kit: TF-100

  8. Back To Top    #8

    Join Date
    May 2010
    Location
    Dallas TX
    Posts
    181

    Re: Gunite discoloration

    Thanks for the feedback!

    I can't tell that there is any issue at all except the discoloration. The plaster is smooth, feels great. Even the step edges, etc with a lot of traffic are in good shape. 5kids in the house! pool gets lots of use. I have been performing VERY careful maintenance of the chems to try to maximize plaster & equipment life.

    I'll wait till there is a structural or severe cosmetic issue with the plaster before replacing.
    33k Gunite, CompuPool CPSC48 SWG, Sta-Rite System 3 DE, 2.25hp dual-speed, POOLVERGNUEGEN Pressure-side

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