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Thread: Hard Water Stains - 20 Years Old!

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    Hard Water Stains - 20 Years Old!

    These hard water stains are from the previous owner not keeping the PH balanced, I believe. And they've never cleaned the tile in the 20 years that they owned the pool. I took a pressure washer to it, and it got some of the thicker layers off (you can see in the photo). I sprayed a 3 to 1 mix of water/muriatic acid on it, and it was smoking all over the white areas. But it's not helping much. I haven't tried a wire brush yet, but I was wondering if there is anything else I can do.

    I'm currently draining and refilling the pool, so I'd like to make some progress on it before I fill it again.



    Pool Size: 25,000 Gallons (IG)
    Type of Filter: Hayward Max-Flo II
    Pool Surface: Plaster
    Pump Size/Flow Rate: (will update)

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    Melt In The Sun's Avatar
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    Re: Hard Water Stains - 20 Years Old!

    Well, your options are limited and it sounds like you pretty much know them all. The acid/water mix and brush will eventually take it all off, but it'll probably drive you nuts before you get it done. You can have it bead blasted...we've had a few reports of that working beautifully.
    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
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    Re: Hard Water Stains - 20 Years Old!

    +1 what MITS said.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Richard320's Avatar
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    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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    Re: Hard Water Stains - 20 Years Old!

    Thanks for the links and the suggestions. I spent about 3 hours yesterday using a sharp putty knife, some elbow grease, and a muriatic acid mix and was able to get about 1/3 of the pool tile done. I am pretty sore today, and I'm going to have another go at it soon. I'll post a pic if I can remember to take one later. I'm tempted to buy a sand-blasting kit since I already have an air compressor, but we'll see.
    Pool Size: 25,000 Gallons (IG)
    Type of Filter: Hayward Max-Flo II
    Pool Surface: Plaster
    Pump Size/Flow Rate: (will update)

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