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Thread: Differences in pumice stone

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    Jim H.'s Avatar
    Join Date
    Jun 2014
    Tucson, AZ

    Differences in pumice stone

    Previous owner left a variety of pool supplies, including two different pumice stones. One is pink in color, very light (weight) and the block is almost square. The other pumice stone is a dark mottled gray color, very heavy, and is almost the size of a 6 inch 2x2. I have no experience with pumice to remove Ca deposits on tile. Is one type better than the other? I worked a small area with each one and the pink version is quite "soft", gets used up quickly compared to the heavier and "tougher" gray one. The gray type looks like it could like it could be too aggresive to use. The tile is smooth and slippery below the water line but rough above. Don't know if this is because of the scale or from use of the pumice stone by previous owner. Did a search but could not find any posts dealing exactly with this question. Thanks for any advice.

    Latest test results:
    FC 13
    CC 0
    pH 7.5
    TA 130
    CH 625
    CYA 140

    Working on getting CYA down as much as I can, in process of reducing pH to 7.2 with MA. Taking it slowly because of warnings here that pH results can be artificially high due to my Cl level. Dumped all the Trichlor and using 10% Bleach for chlorination.
    9000 gal. IG plaster pool/spa, built in 2005. Cartridge filter, sta-rite system3 Model s8m150. Max flow rate 125 gpm. No SWG. 5 panel Heliocol solar heating system.

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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Differences in pumice stone

    I just bought grey pumice stones at the 99 store, and they're really soft. Test the two you have somewhere not too visible when people come out to admire the sparkle and see.

    Leave the pH alone for now. It's almost certainly lower than what it reads at that FC level.
    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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