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Thread: Limestone pool deteriorating

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    Limestone pool deteriorating

    A friend of mine has a salt water pool that was installed about a year ago. The Limestone, which was sealed with miraclesealer, has some pretty bad deterioration on the parts of stone that are not always submerged by the water, IE the waterline.

    Could this have been prevented by a different sealer specifically made for salt pools? Or is Limestone a mistake to use for saltwater pools?

  2. Back To Top    #2
    msgtdan's Avatar
    Join Date
    Jul 2011
    SW MO

    Re: Limestone pool deteriorating

    I've heard that pools with softer stone shouldn't have a swg, but that seems to be a very quick deterioration.
    Dan D
    Used 2003 Aqua Leader 27'x52", 17,800 w/10" hopper, SwimPro SW256T 250# sand filter, Hayward PowerFlo LX pump 1hp impellor, Emerson 1 1/2 hp motor, setup Aug 2012 Summer 2011 used Summer Escapes Ring pool 14' x 42", Intex 1600gph sand filter, HTH 6 way test kitTF-100 w/stirrer, Well water @ FC=0, PH=7.2, TA=290, CH=320

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    Join Date
    Mar 2011
    Houston, Texas

    Re: Limestone pool deteriorating

    I agree with the above post. It depends on the stone. I've had friends who had some soft flagstone coping/decking say that their SWG was the worse thing they did. They had to replace their decking within a couple of years.

    I have travertine coping and after 2+ years with a SWG I just noticed some minor errosion on one piece of coping. My travertine is not very porous and I used a good sealer. All-in-all, I'm pleased with my SWG.
    9,200 gal. Gunite Luna Quartz French Grey pool with spill over spa, two fountains on tanning ledge (rarely used)
    Pentair Whisperflo 2HP, Pentair CCP Cartridge 420 Sq. Ft., Polaris 280 with booster pump
    Pentair EasyTouch 4, RayPak LoNox 266k Natural Gas heater, Aqua Rite SWCG T Cell 9, Borates, TF-100 test kit

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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Limestone pool deteriorating

    Welcome to TFP!

    As was pointed out, porous stones, such as some limestones (it depends on the quarry), are a poor choice in general, but will deteriorate faster if there is saltwater splash-out and evaporation. However, whether this is a problem also depends on weather since in places with significant frequent summer rains, the salt is diluted by the rain especially if the humidity is high in between the rains so that there is minimal evaporation. It is the splash-out and evaporation cycle that builds up the level of salt in the stone and the evaporation results in salt recrystallization pressure that fractures the stone.

    There seem to be more problems in some areas of Texas because of the combination of the hot dry weather with soft porous local stones. Arizona has some reports though not seemingly as many while Florida and the Northeast don't seem to get as many reports of issues.

    Sealing the stone will help in all cases and using a less porous stone and sealing it will have it last significantly longer regardless of pool type (saltwater or not).
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Re: Limestone pool deteriorating

    Thanks for all the great responses!

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