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Thread: New white grout turning YELLOW! Help!

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    JenniferJuniper2's Avatar
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    New white grout turning YELLOW! Help!

    Hello all,

    We recently had our pool replastered and the waterline tile replaced. The grout was white when installed (like 3 weeks ago). Now, wherever it's exposed to water, it is yellow! Please see pic. Any ideas as to what's causing this? It started to look very slightly yellow right away, but I figured maybe that's just what it's supposed to look like when wet. Now it's REALLY yellow.

    If it matters, we've had a pool guy doing our start up (regular start up, not a hot start) and he was coming out a few times per week for the first 2 weeks. No one came last week because our guy is on vacation. The water turned a little green, and on his advice (we texted him) he said to add algaecide, which solved the water problem. I understand algae can stain, but this is yellow, not green, and when we scrub it nothing happens. Our water wasn't even very green, just a little bit. And our water has been back to blue for a week now, but the grout is still yellow! Help!

    See pic:



    This is a pic inside the mouth of the skimmer. The parts underwater are yellow and the parts out of water are white. The yellowing is not confined to the skimmer though. It appears to be anywhere the grout is under water.
    15k gal freeform sport pool with rock waterfall. Replastered 5/2016 with Tahoe Blue Quartzscapes
    Taylor FAS-DPD K-2006 test kit
    Jacuzzi 2002 J 310

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    Re: New white grout turning YELLOW! Help!

    What did you scrub it with?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Kpag's Avatar
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    Re: New white grout turning YELLOW! Help!

    You can upload for free and without an account on tinypic.com.
    IG ~12000 gallon 1988 freeform pool with IG spa, Hayward equip, Ecostar pump. Remodel done: NPT Arctic 1x2 tile in Lagoon w/ gray thinset & Light Pewter grout, French Gray PebbleSheen w/ grey fittings, Leuders buff eased edge limestone coping w/ Light Buff mortar, buff mastic

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    JenniferJuniper2's Avatar
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    Re: New white grout turning YELLOW! Help!

    Quote Originally Posted by duraleigh View Post
    What did you scrub it with?
    At first I just scratched it a bit with my fingernail. Then we tried a brush with some granulated chlorine. Neither seemed to do anything really.

    - - - Updated - - -

    Thanks Kpag!! I added the pic to my original post.
    15k gal freeform sport pool with rock waterfall. Replastered 5/2016 with Tahoe Blue Quartzscapes
    Taylor FAS-DPD K-2006 test kit
    Jacuzzi 2002 J 310

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    Mod Squad kimkats's Avatar
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    Re: New white grout turning YELLOW! Help!

    I bet we can help! Someone on here will know what to do! Lets start with the basics-how do you test your water and what were the last test results? The answer to this will really help us help you.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    JenniferJuniper2's Avatar
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    Re: New white grout turning YELLOW! Help!

    Quote Originally Posted by kimkats View Post
    I bet we can help! Someone on here will know what to do! Lets start with the basics-how do you test your water and what were the last test results? The answer to this will really help us help you.

    Kim
    I sure hope so!



    It looks like the chlorine is about a 1 and the "Br" is about 2. The Ph looks like 7.5. I took this pic immediately after taking the sample. If I let the test kit sit for a few minutes the chlorine side looks more like a .5. Not sure how long I am supposed to let it sit or how old my test chemicals (or whatever they are) are (the kit was under the sink when I moved in 2 years ago...looked like it had never been used tho).

    I'm not sure what you mean by how I test the water...lol usually I don't test it at all! Because the pool guy does it. But the kit I have (which I only used for the 2nd time ever today) is a little kit that comes with droppers of some kind of colored stuff that you add to the sample water.

    If it helps, the yellowing is not confined to any one area. It appears to be everywhere that the grout is under water.
    15k gal freeform sport pool with rock waterfall. Replastered 5/2016 with Tahoe Blue Quartzscapes
    Taylor FAS-DPD K-2006 test kit
    Jacuzzi 2002 J 310

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    JenniferJuniper2's Avatar
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    Re: New white grout turning YELLOW! Help!

    No ideas? My pool looks horrible, I am ready to cry. Now we are getting greenish splotches everywhere. The water is crystal clear and the green does not budge at all when you brush it, so I don't think it's algae. The color started out bright blue, almost TOO blue. Now it's teal-ish and blotchy and I hate it.

    I really can't get a good picture of it but this is the best I could do. You can kind of see the streakiness, but not much of the green. You can kind of see it in the bottom 3rd of the pic, near the middle. Its much worse in real life.



    Pool guy was not much help. He said the grout could be due to the start up chemicals, and that the greenishness could be because it's not done changing color. But none of the pics I've seen online for this color look green, and that doesn't explain why splotches would turn green while others are still blue. If it helps, the greenish splotching seems worse in the sunny side of the pool.
    15k gal freeform sport pool with rock waterfall. Replastered 5/2016 with Tahoe Blue Quartzscapes
    Taylor FAS-DPD K-2006 test kit
    Jacuzzi 2002 J 310

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    JenniferJuniper2's Avatar
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    Re: New white grout turning YELLOW! Help!

    I am guessing whatever is turning the grout yellow is probably turning the blue finish green....but what's the culprit?
    15k gal freeform sport pool with rock waterfall. Replastered 5/2016 with Tahoe Blue Quartzscapes
    Taylor FAS-DPD K-2006 test kit
    Jacuzzi 2002 J 310

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    Re: New white grout turning YELLOW! Help!

    First I would call the guy who installed the tile and the person you paid and have them come look at it.
    22k gallon IG pebblefina, Jandy 1.5 HP VS, Jandy CV Cartridge filter, Fafco solar panels, Polaris 360 supply side cleaner, waterfall

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    Mod Squad pooldv's Avatar
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    Re: New white grout turning YELLOW! Help!

    That chlorine level of 1 ppm and green stuff is telling me you have algae in your pool. You may have read enough here to know the drill. Get a good test kit, fire the pool guy, don't go to the pool store, take care of your own pool and it will look much better than what the pool guy does.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: New white grout turning YELLOW! Help!

    Update! My husband read somewhere to rub vitamin C on it and see what happens. Guess what? The grout turned back to white and the plaster turned back to blue where we rubbed it. I think that means something about metals in the water?

    It does not seem like algae at all. First of all, it got worse after we tried algaecide (the water cleared up but the finish kept in turning green). Secondly it's not slimy and if I scratch it with my fingernail it doesn't budge. The vitamin C (Asorbic acid) took the yellow off without any scrubbing...I just rubbed it for like 2 seconds with my fingertips.
    15k gal freeform sport pool with rock waterfall. Replastered 5/2016 with Tahoe Blue Quartzscapes
    Taylor FAS-DPD K-2006 test kit
    Jacuzzi 2002 J 310

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    Mod Squad pooldv's Avatar
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    Re: New white grout turning YELLOW! Help!

    That is most likely copper staining then. The most common sources of copper in water are algaecide, alternative mineral pool sanitizers and corrosion from a copper heat exchanger and low PH, below 7.0. More here, Pool School - Metals in the Water and Metal Stains
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Mod Squad kimkats's Avatar
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    Re: New white grout turning YELLOW! Help!

    Do remember what algaecide you used? Let us know. I bet it has copper in it

    We CAN help you get and keep your pool clean and pretty again. BUT to do so you have to help us help you by getting a good test kit. Without it you are spending way too more money than you need to and adding stuff to your pool that is doing more harm than good (yellow grout and green pool).

    Look in my siggy for the best test kit.........it has more of the stuff we use every day.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    JenniferJuniper2's Avatar
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    Re: New white grout turning YELLOW! Help!

    Thanks guys, we are gonna try to get a kit this weekend.

    One other question....is it safe to swim in? Thr algaecide was added over a week ago.
    15k gal freeform sport pool with rock waterfall. Replastered 5/2016 with Tahoe Blue Quartzscapes
    Taylor FAS-DPD K-2006 test kit
    Jacuzzi 2002 J 310

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    Mod Squad pooldv's Avatar
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    Re: New white grout turning YELLOW! Help!

    It is safe to swim when
    Chorine is above minimum and below shock level for your CYA, Chlorine CYA Chart
    PH is between 7.2 and 7.8
    The water is clear

    Algaecide won't hurt you, it can just add copper which can turn blond hair green, fingernails green and even a white dog green. Funny right!

    Cloudy water and chlorine below minimum for CYA are the only safety concerns from a pool sanitation standpoint and preventing person to person disease transmission.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Mod Squad kimkats's Avatar
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    Re: New white grout turning YELLOW! Help!

    When you look for a kit look for the Taylor 2006 (NOT the 2005) OR order from the link in my siggy. I think the TF-100 is a MUCH better bang for the buck than the Taylor 2006.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    JenniferJuniper2's Avatar
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    Re: New white grout turning YELLOW! Help!

    Thanks everyone! I will look at those kits for sure.

    UPDATE: For now, since we don't have a decent kit, we took the water to the pool store to test.

    There were zero metals. But the calcium hardness was super high at 900. (Should be 200?) The pH is also way high-- above 8. Can calcium stain yellow? There is a bit of white staining too which I already figured was calcium, but there is barely any white staining.

    If it helps, the algaecide we used was Poolife Super Algaecide 60.

    ETA: when we used our kit to test yesterday it said the ph was 7.5. So I am not sure why the pool store results would be different? Our kit might be old, would that make a difference? It was under the sink when we moved in but it looked really new.
    15k gal freeform sport pool with rock waterfall. Replastered 5/2016 with Tahoe Blue Quartzscapes
    Taylor FAS-DPD K-2006 test kit
    Jacuzzi 2002 J 310

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    Mod Squad kimkats's Avatar
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    Re: New white grout turning YELLOW! Help!

    Age does mess with the test regents as well as how the it is stored. It should be kept in a cool, dark place.

    I will also tell you your tests will be MUCH better than the store when you get your good test kit. P$ do not use the greatest care or procedures. Things such as not cleaning the equipment in between the tests to the machines not being calibrated properly.

    I ruined my first pool doing what the P$ told me to do I now spend LESS all summer then what I used to spend in ONE month using the pool store.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Mod Squad pooldv's Avatar
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    Re: New white grout turning YELLOW! Help!

    The metal doesn't always show up on a test when it is either sequestered or in stains in the plaster. You already proved that there is metal in the water when Vit C removed the stain.

    No, CH cannot stain yellow. Although, the pool is at risk of calcium scale with CH that high. Maintaining your CSI slightly negative, -0.1 to -0.3 will prevent scaling. Poolmath will calculate CSI for you. More here, Pool School - Calcium Scaling and here, Langelier and Calcite Saturation Indices (LSI and CSI)

    Neither PH test is particularly reliable hard to pick which might be more wrong, or least wrong.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    JenniferJuniper2's Avatar
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    Re: New white grout turning YELLOW! Help!

    So to get rid of the stains, does it matter what kind of acid we use? The pool store sold my husband (I wasn't there) some muriatic acid (to lower the ph). Will that work to get rid of the green? Or do I need Ascorbic acid?
    15k gal freeform sport pool with rock waterfall. Replastered 5/2016 with Tahoe Blue Quartzscapes
    Taylor FAS-DPD K-2006 test kit
    Jacuzzi 2002 J 310

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