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Thread: grey spots- diamond brite

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    grey spots- diamond brite

    this pool was replastered March 2008 with Diamond Brite super blue batch tx121707507 by an authorized applicator. last year I started seeing grey spots on the shallow end floor. the spot sizes vary but are typically approximately 2 inches in diameter. they disappear/reappear daily not in relation to any time of day, sunlight or water temperature and are not stationary (different location and number when they reappear.) last year I had emailed these photos to SGM tech support in Florida who had no suggestion or thought to resolve.

    this year the spots are increasing in number and also starting to appear in the deep end. I understand SGM had warranty issues with other Diamond Brite pools in this area (Louisiana) but there doesn't seem to be any information that could relate to my situation,

    I had the applicator inspect and he suggested acid wash without any explanation as to cause.

    I tested for metals using Hach test strips. no metals. plumbing is all plastic, no heater.

    chemistry:

    TH 250
    TC 4
    FC 7
    ph 7.2
    TA 80
    CYA 50

    municipal water. this area has quite a few chemical plants. with that in mind, I'm thinking about dumping water and refilling.

    any ideas or suggestions?
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    Melt In The Sun's Avatar
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    Re: grey spots- diamond brite

    Welcome to TFP!
    Those looks like spots form organic matter sitting on the bottom, like a leaf or an acorn. If you have a chlorine puck around, try diving down and scrubbing one of them with it for a little bit. If it is an organic stain, just upping the chlorine level in the pool will make them fade. Whatever it is, chemical plants have nothing to do with it.

    We also recommend that everyone gets their own test kit and does their own testing, because pool store testing is often nonsense...e.g. your FC cannot possibly be higher than TC.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
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    Re: grey spots- diamond brite

    I'm using Hach Aquachek 7 strips and a Taylor TF-100. My eyesight isn't that sharp with the colors but the Hach color range for TC and FC are both 5-10, which Hach says is ideal. They might be 5 & 5 but without better eyes, I can't be sure. The Taylor drop test came back 6 ppm free chlorine. CC was 8? I added bleach night before I did these retests.

    Did the puck thing last year with no change. There's nothing plant wise by the pool other than airborne pollen. Closest tree is downhill about 300 ft away.

    appreciate the response--

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    Melt In The Sun's Avatar
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    Re: grey spots- diamond brite

    How about fertilizer? Could be iron.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

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    Re: grey spots- diamond brite

    appreciate the response but no fertilizer or other lawn chemicals.

    in my first post I had mentioned of other 2008 Diamond Brite customers this area with similar problem. I am hoping someone on this board had information what had occurred. the spots come and go, and aren't in the same location. don't know if there is something in the water or in the finish that's reacting with water? thanks again

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    Butterfly's Avatar
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    Re: grey spots- diamond brite

    Quote Originally Posted by builder_bob504 View Post
    appreciate the response but no fertilizer or other lawn chemicals.

    in my first post I had mentioned of other 2008 Diamond Brite customers this area with similar problem. I am hoping someone on this board had information what had occurred. the spots come and go, and aren't in the same location. don't know if there is something in the water or in the finish that's reacting with water? thanks again
    Interesting.....this sounds like organic stains.

    The Taylor drop test came back 6 ppm free chlorine. CC was 8? I added bleach night before I did these retests.
    Please retest with the TF100 and post results. Your CC test is especially curious.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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    Re: grey spots- diamond brite

    Fc- 6
    cc- 0
    ta- 70
    ch- 250
    cya-50
    ph- 7.3

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    Butterfly's Avatar
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    Re: grey spots- diamond brite

    Thanks! Are you brushing? Still sounds organic to me.

    What about an OCLT?
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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    Re: grey spots- diamond brite

    brush weekly, day before vacuuming. OCLT tests last year. no overnight FC level change.

    (quote)
    poodlegirl

    10-31-2009, 03:18 PM

    I have had your exact problem with Diamond Brite. From what I've been told, the streaks are fairly common. The black spots are not. I had the same problems with the black spots. A Diamond Brite representative came to my house and told me they will honor the warranty. The only problem is that they supply the product but the contractor has supply the free labor. My contractor has been great and has agreed to do this. I would contact SGM myself in your situation. You can google SGM (that's who makes the product) and it will come up. The SGM stands for Southern Grout & Mortar. Call them and ask to leave a message for technical support. The guy I dealt with is out of Dallas. I live in south Louisiana. The guy from SGM I dealt with is very nice. It just depends on where you live as to what representative you deal with. I had the Marlin Blue color and had my pool refinished in June of 2008. (unquote)

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    Butterfly's Avatar
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    Re: grey spots- diamond brite

    brush weekly, day before vacuuming. OCLT tests last year. no overnight FC level change.
    When was the OCLT?

    The spots look organic to me.

    You might want to send a PM to poodlegirl and ask her about her experience and if she has pics.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: grey spots- diamond brite

    applicator did OCLT December last year. I had tried to contact poodlegirl but was unsuccessful. I can't be sure if the spots are moving when the reappear or not but either way, I would question whether they are organic. I had tried a number of different tactics on the spots such as brushing which had no discernable impact on their appearance. another question would be organic source. pool is next to house and part of a cement patio system. no trees or bushes nearby, just grass (grass is bagged during mowing.)

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    Butterfly's Avatar
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    Re: grey spots- diamond brite

    I think you misunderstand the OCLT. This is what you should do to rule out/in organics: http://www.troublefreepool.com/conte...loss-test-oclt
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: grey spots- diamond brite

    spots started earlier last year. in late December the applicator ck'd pool and among other things did OCLT, which at that time was negative for organics. do I understand you think cause of symptoms (spots) changed from December to date? everything else has been pretty much constant (chemistry, weekly testing, run filter year round, brushing/debris daily etc. does OCLT needs repeating?

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    Re: grey spots- diamond brite

    Yes, you need to perform the OCLT yourself.

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    Re: grey spots- diamond brite

    8/29 7P test FC-5
    CC-0

    8/30 6A test FC-5
    CC-0

  16. Back To Top    #16

    Re: grey spots- diamond brite

    rechecked sunup this morning with TF100, heavy rain yesterday most of day-

    FC- 4.5
    CC- 0
    TA- 70
    CH- 250
    CYA- 50
    PH- 7.5

  17. Back To Top    #17
    Butterfly's Avatar
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    Re: grey spots- diamond brite

    What type of brush are you using?

    Has your CYA been allowed to get higher than 50?

    Has your FC stayed close to 4 or maybe even dropped below?

    Have you rubbed a trichlor tab on a stain/spot to test if t is organic?
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  18. Back To Top    #18

    Re: grey spots- diamond brite

    nylon

    no

    yes

    yes

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    Butterfly's Avatar
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    Re: grey spots- diamond brite

    You need another brush for the plaster that is over a year old:
    Brush recommendations:

    Nylon is for vinyl, fiberglass, tile, and plaster that is less than one year. (Plaster includes any exposed aggregate and marcite finish, btw!) Combo brushes are for older plaster. All stainless are for algae (very stubborn green algae and also the ONLY brush for black algae.)

    You CAN unscrew the Wall Whale from the nylon brush it comes with and screw it on a combo brush if your plaster is over a year old. Newer plaster is really too soft for anyting other than a nylon brush.
    Running the FC at the minimum and sometimes allowing it to dip below minimum can create conditions that allow black algae to get a foothold. Not saying for sure that you have BA, just another piece of info.
    I suggest you try running the FC at the high end of your FC/CYA level, iow, 8 FC.

    Try to scratch some of the stain/spot of with your fingernail/knife and smear it on white paper. If it is green, it is algae. To help confirm:

    I suggest you place a trichlor tab on a stain and let it sit for a couple minutes to see if it lightens. If no joy, try the same thing with a cheap vitamin C tablet.

    Tests that were done last year don't count!
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  20. Back To Top    #20

    Re: grey spots- diamond brite

    have already tried vitamin C and trichlor with no change.

    stain cannot be disturbed by scratching- it appears to be imbedded.

    will try higher FC and stainless brush- not optimistic.

    appreciate your attempts to help

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