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Thread: Pool stained after SLAM

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    Pool stained after SLAM

    I recently had an algae bloom and have been doing the SLAM process for the past several weeks. My water is now clear and I passed the other two tests so I am confident the algae is gone.

    However, one of the things I have discovered with my newly clear water is that the bottom of my pool is now stained pretty extensively. The stains are brownish in color and are visible throughout the pool. I have tried the puck test but the stains did not seem to lighten. Since I have been doing battle with the algae I feel like the stains are likely organic so am wondering why the puck has no effect. I don't have any vitamin C on hand to try the other test.

    Now that the SLAM is complete I have a full set of test results to share.

    FC = 6.5
    CC = 0.5
    pH = 7.5
    TA = 40
    CH = 50
    CYA = 25

    Here are a couple photos of the stains.





    Please let me know your thoughts on my options for removing the stains.



    IG gunite pool / 30,000 gal / 20'x 40'/ built mid 70's
    1.0 HP Hayward Super pump / Polaris PB4-60 booster pump
    Pentair SD-80 sand filter
    Intermatic mechanical timer (PF12222TB)
    Location: Augusta, GA, TF100 test kit

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    Re: Pool stained after SLAM

    For what it is worth, I recently discovered faint stains on my fiberglass/plastic (?) steps in my pool wer from metals. I did not have vitamin C on hand but I had ascorbic acid in my kitchen in the for of brand name "fruit fresh" (it is ascorbic acid used while canning.....just ascorbic acid). I used some of this on my stains in a small area and they literally disappeared. Try the vitamin C test or find ascorbic acid and you will know.
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

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    Smykowski's Avatar
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    Re: Pool stained after SLAM

    I'm wih Aimee, looks like metals. Depending on how the pool was maintained before you took it over, it could be scaling as well. Try Vitamin C and let us know what happens.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Re: Pool stained after SLAM

    VERY VERY hard to tell from pics but I would say calcium scale. Since calcium is a metal, it should react to the Ascorbic acid in vitamin C tabs.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Pool stained after SLAM

    Just picked up some vitamin C tonight and will try the test in the morning. FWIW, the stains do not feel rough so not sure if it's scaling. Will report on the vitamin C results tomorrow.


    IG gunite pool / 30,000 gal / 20'x 40'/ built mid 70's
    1.0 HP Hayward Super pump / Polaris PB4-60 booster pump
    Pentair SD-80 sand filter
    Intermatic mechanical timer (PF12222TB)
    Location: Augusta, GA, TF100 test kit

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    Re: Pool stained after SLAM

    I did the vitamin C test this morning and the stains definitely lightened when I rubbed them. So I guess my next step is to do the ascorbic acid treatment outlined here:

    http://www.troublefreepool.com/threa...f-metal-stains

    In terms of quantity, it says to use 1/2 to 1 pound for each 10,000 gals. I have 30k so I'm looking at 1.5 to 3 lbs. my staining is pretty extensive so should probably go for the higher level. I have seen you can purchase in bulk in quantities of 1 or 5 lbs, but have not seen 3 lb options, which would be just right.

    I'll need to let my chlorine get down to 0 and acquire some polyquat 60 to prevent algae.

    Any other tips?



    IG gunite pool / 30,000 gal / 20'x 40'/ built mid 70's
    1.0 HP Hayward Super pump / Polaris PB4-60 booster pump
    Pentair SD-80 sand filter
    Intermatic mechanical timer (PF12222TB)
    Location: Augusta, GA, TF100 test kit

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    BoDarville's Avatar
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    Re: Pool stained after SLAM

    Follow the advice in the article you linked to above for the ascorbic acid treatment. From your comments, it sounds like you have a good grasp of the process.

    Just curious, what is the source of your fill water - municipal or from a well?
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
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    frustratedpoolmom's Avatar
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    Re: Pool stained after SLAM

    I'm just gonna throw this out there... FWIW

    You just completed the SLAM process, and the season is just beginning. For the AA treatment you have to lower the FC very low for the process to work - it can and has if not handled properly opened the door to another algae bloom - just wondering if you can live with the stains until the end of the season and do the AA treatment then? Personal preference, just thought I'd mention it.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
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    Re: Pool stained after SLAM

    @BoDarville Thanks for your comments. My water is municipal.

    @Frustratedpoolmom I really want the kids to use the pool this summer and they have told me the stains look gross. I definitely want to clear the stains before summer to make it as attractive as possible.


    IG gunite pool / 30,000 gal / 20'x 40'/ built mid 70's
    1.0 HP Hayward Super pump / Polaris PB4-60 booster pump
    Pentair SD-80 sand filter
    Intermatic mechanical timer (PF12222TB)
    Location: Augusta, GA, TF100 test kit

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    frustratedpoolmom's Avatar
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    Re: Pool stained after SLAM

    Good Luck, let us know if we can help so things go smoothly!
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Pool stained after SLAM

    I would want to clear it up too. Nothing looks worse IMO than a pool with unsightly stains. If your algae comes back you know how to deal with it.
    I'd bet you my bikini you'll never get TFP water from a pool store!

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  12. Back To Top    #12

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    Re: Pool stained after SLAM

    I'm starting to price out the materials I will need for the ascorbic acid treatment and just wanted to make sure what I'm thinking sounds right. These prices were the best I could find online.

    Ascorbic Acid (bulk, 5lbs): $32.50
    Polyquat 60 (3 quarts @ $17.99 ea): $53.97
    Jacks Pink Stuff (3 quarts @ $17.99 ea): $53.97

    Do these quantities look right for a 30,000 gal pool? Seems like a lot of $$ and I almost feel like I'm getting pool-stored again. I do want to get rid of the stains, however.
    IG gunite pool / 30,000 gal / 20'x 40'/ built mid 70's
    1.0 HP Hayward Super pump / Polaris PB4-60 booster pump
    Pentair SD-80 sand filter
    Intermatic mechanical timer (PF12222TB)
    Location: Augusta, GA, TF100 test kit

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    Re: Pool stained after SLAM

    I believe I read in that article on the AA treatment one could use citric acid as well. It might be worth checking prices with local foodservice distributes for that.
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

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    Re: Pool stained after SLAM

    I haven't had time to treat the pool stains yet and keep testing to be sure they are indeed metallic. I tried the puck test and there was no noticeable lightening. When I do the vitamin C test I do see it lighten if I rub vigorously, but nothing much if I just leave it on the stain for a while. Is that definitive enough that the stain is metallic? I just want to be sure before I invest the money in the ascorbic acid, sequestrants, polyquat, etc.

    Any words of wisdom?


    IG gunite pool / 30,000 gal / 20'x 40'/ built mid 70's
    1.0 HP Hayward Super pump / Polaris PB4-60 booster pump
    Pentair SD-80 sand filter
    Intermatic mechanical timer (PF12222TB)
    Location: Augusta, GA, TF100 test kit

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    Richard320's Avatar
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    Re: Pool stained after SLAM

    It looks like Calcium with embedded organics in it. Does it look worse when it's overcast or shaded, and nearly disappear when the full sun is on it? Scale does that.

    If you leave the puck on it for a couple hours, does it leave a white spot? Pucks are very acidic and will loosen scale. They'll also etch the surface.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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  16. Back To Top    #16

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    Re: Pool stained after SLAM

    The way it looks doesn't change that much when shaded or in full sun. Also, putting a puck on it makes little difference. Here is a pic of how it looks currently:



    My current test results are:

    FC 4
    CC 0
    PH 7.5
    CH 50
    TA 50
    CYA 25

    Water is crystal clear.

    Working on getting up to 40 range on the CYA using the sock method.

    I know once I start the AA treatment I will need to get FC down to zero and bring my Ph down closer to 7. Any other recommendations for tweaking the water before the AA?
    IG gunite pool / 30,000 gal / 20'x 40'/ built mid 70's
    1.0 HP Hayward Super pump / Polaris PB4-60 booster pump
    Pentair SD-80 sand filter
    Intermatic mechanical timer (PF12222TB)
    Location: Augusta, GA, TF100 test kit

  17. Back To Top    #17

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    Re: Pool stained after SLAM

    I'm still dealing with these stains. Have not had a chance to try the AA treatment so far.

    I did notice some rusty spots on my ladder. Could that be a possible cause of the staining?
    IG gunite pool / 30,000 gal / 20'x 40'/ built mid 70's
    1.0 HP Hayward Super pump / Polaris PB4-60 booster pump
    Pentair SD-80 sand filter
    Intermatic mechanical timer (PF12222TB)
    Location: Augusta, GA, TF100 test kit

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