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Thread: Can these stains be scrubbed off (pic)

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    Can these stains be scrubbed off (pic)

    I have a high CYA level of 200. I'm assuming these purple stains are are result from that?? Not sure, but I will be draining my pool soon and wanted to know if these stains can be removed with scrubbing the sides of the pool with a stainless steel pool brush or is there another method? Will these stains dissappear if I get the CYA levels down to 30-50 ?https://flic.kr/p/sa8gz3
    16,000 gallon, IG, Plaster, pool and spa.

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    Re: Can these stains be scrubbed off (pic)

    Sorry, can't seem to get the pictures to load on here.

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    Richard320's Avatar
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    Re: Can these stains be scrubbed off (pic)

    Are you sure those are stains, and not the original color showing through worn off paint?

    High CYA didn't cause anything like that in my pool, and I started with it about 240 when I took over the maintenance.
    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.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Mod Squad tim5055's Avatar
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    Re: Can these stains be scrubbed off (pic)

    Richard beat me, but not stains from CYA. I also had 200+ CYA with no staining. It does look like wear to the surface or etching of some sort.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Can these stains be scrubbed off (pic)

    It's also on the sides of the tile where the spa pours out and into the pool. It's like a tough chalky substance.
    16,000 gallon, IG, Plaster, pool and spa.

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    Mod Squad tim5055's Avatar
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    Re: Can these stains be scrubbed off (pic)

    Quote Originally Posted by mendez4047 View Post
    It's like a tough chalky substance.
    Calcium scale, maybe?
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Can these stains be scrubbed off (pic)

    Purple cyanurate maybe?
    16,000 gallon, IG, Plaster, pool and spa.

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    Mod Squad tim5055's Avatar
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    Re: Can these stains be scrubbed off (pic)

    Quote Originally Posted by mendez4047 View Post
    Purple cyanurate maybe?
    I've never heard of it, but this guy has and wants to sell you a bottle of metal & stain control.....

    He claims it's caused by high CYA (which you have), copper in the water (do you?) and high TA & high pH. Have you tested for copper?
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Can these stains be scrubbed off (pic)

    Haven't tested copper yet. I'll do it this weekend.
    16,000 gallon, IG, Plaster, pool and spa.

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    Re: Can these stains be scrubbed off (pic)

    Quote Originally Posted by tim5055 View Post
    I've never heard of it, but this guy has and wants to sell you a bottle of metal & stain control.....

    He claims it's caused by high CYA (which you have), copper in the water (do you?) and high TA & high pH. Have you tested for copper?
    That's how I came up with my guess about purple cyanurate because that's exactly what my pool has.
    16,000 gallon, IG, Plaster, pool and spa.

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    Re: Can these stains be scrubbed off (pic)

    Did a copper test today. Zero copper in the water.
    16,000 gallon, IG, Plaster, pool and spa.

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    Re: Can these stains be scrubbed off (pic)

    I will be draining my pool this weekend. Should I acid wash? or can this be scrubbed off? anyone?

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