Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 8 of 8

Thread: SWG pools and natural stone decking corrosion...true/myth?

  1. Back To Top    #1

    SWG pools and natural stone decking corrosion...true/myth?

    I'm looking to put in a new pool and different builders are saying different things about SWG pools and whether or not they will damage natural stone coping/decking. I'm looking at Tennessee Crab Orchard or Norwiegan Buff for the stonework and would like to also have the stone laid underwater in the benches and sun shelf.. Some say that the SWG will damage the stone and are asking me to sign a waiver and others are saying that SWG pool water is like sweat or tears and it won't damage the stone. What's the real truth? Thanks!
    8 lane 25 meter 200,000 gallon outdoor pool (liquid chlorine)
    3 lane 25 yard 60,000 gallon indoor pool (liquid chlorine)
    3 Spa's 1200-600 gallon (trichlor/liquid chlorine)
    1 kids pool 40,000 gallon
    14x24 above ground SWG
    44,000 inground home pool (trichlor/liquid chrloine)
    AFO/CPO/LGIT/WSIT
    Southwest Utah Health Inspector/Pool Regulator

  2. Back To Top    #2
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Location
    Houston, Texas
    Posts
    9,199

    Re: SWG pools and natural stone decking corrosion...true/myt

    The real truth is it depends on the stone. Softer stones will erode and flake with prolonged exposure to salt water. Do the ones who want you to sign a waiver require it for all salt water pools or just pools with specific types of stone work?
    TFP Moderator
    Helpful links: TF Test Kits,TFP Pool School, PoolMath
    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
    Love TFP? Become a
    TFP Supporter!

  3. Back To Top    #3

    Join Date
    Jul 2007
    Location
    Brisbane, Australia
    Posts
    874

    Re: SWG pools and natural stone decking corrosion...true/myt

    and then the soft ones can be sealed to prevent it
    not sure about underwater though

  4. Back To Top    #4

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: SWG pools and natural stone decking corrosion...true/myt

    Underwater shouldn't be as much of a problem. The issue with higher salt levels and stone has more to do with repeated splash-out and evaporation cycles that cause salt re-crystallization pressure. That's why areas with regular rains during the summer don't usually have this problem even when using softer stone. As you noted, the stone in the deck (splash-out) area can be sealed, if necessary.
    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"

  5. Back To Top    #5

    Join Date
    Mar 2011
    Location
    Houston, Texas
    Posts
    413

    Re: SWG pools and natural stone decking corrosion...true/myt

    I have travertine (a limestone based stone) coping and I'm concerned about this as well. I sealed it well and after brushing the pool each week I hose down the coping and my decking with fresh water hoping to wash away any salt that would have evaporated. It's only been six months with my SWG but so far so good. I know some people, however, who say the SWG was the biggest mistake they made with their pool because they had to replace their natural stone coping in just a couple of years. I've also seen other salt pools that have waterfalls over flagstone and rocks with no problems at all.
    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

  6. Back To Top    #6

    Re: SWG pools and natural stone decking corrosion...true/myt

    The builder didn't state type of stone in the SWG waiver. From my understanding, Tennessee Crab Orchard is a sandstone and is softer. Therefore, I'll probably go with Norwegian Buff as I believe it's quartz based stone. I assume it would hold up better than standstone. I also may consider the pop-up sprinkler heads to wash/cool the patio down automatically.
    8 lane 25 meter 200,000 gallon outdoor pool (liquid chlorine)
    3 lane 25 yard 60,000 gallon indoor pool (liquid chlorine)
    3 Spa's 1200-600 gallon (trichlor/liquid chlorine)
    1 kids pool 40,000 gallon
    14x24 above ground SWG
    44,000 inground home pool (trichlor/liquid chrloine)
    AFO/CPO/LGIT/WSIT
    Southwest Utah Health Inspector/Pool Regulator

  7. Back To Top    #7

    Re: SWG pools and natural stone decking corrosion...true/myt

    My experience has been right along the lines that chem geek described. Salt recrystalization upon pool water evaporation over time will break the stone. If it has layers, the layers will separate. If it has cracks, they will get bigger. I have not see damage just due to the chemical composition. So, if you can keep the salt from forming crystals and breaking things, you'll be alright. If you can't, you'll have problems. Here in the desert, it will eat away at concrete because you can't rinse it off fast enough sometimes. Sealers and various paints stop that from happening.

    Of course, then you have to maintain the sealer and paints.
    Trying to keep my house under control

  8. Back To Top    #8

    Re: SWG pools and natural stone decking corrosion...true/myt

    Any thoughts on artificial rock, such as Rico Rock? Has anyone used Rick Rock or artificial stones with a SWG? Does it hold up?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •