Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 9 of 9

Thread: Salt Eating Concrete?

  1. Back To Top    #1

    Salt Eating Concrete?

    Hello all!
    I've noticed today, after 2 years of a SWG, that my concrete is starting to deteriorate. There is a flower bed by one of the waterfalls that has displayed a high concentration of salt (visible salt crystals on the surface), now the concrete is crumbling. Just wanted to see if anyone had a similar issue and what the culprit was. I have long thought there to be a leak from the waterfall but re-grout the fixture last summer.
    Thanks!

  2. Back To Top    #2
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: Salt Eating Concrete?

    Welcome to TFP!
    Salt damages Concrete, and unfortunately a lot of people learn that the hard way. You might do a search here for salt damage and concrete/stone sealers.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  3. Back To Top    #3
    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, AZ
    Posts
    3,899

    Re: Salt Eating Concrete?

    You said it's on a flower bed, right? It's possible that has nothing to do with salt, but is cause by water from the flowers seeping through the concrete. Any chance of a picture?
    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
    Make each day your masterpiece. - John Wooden

  4. Back To Top    #4

    Re: Salt Eating Concrete?

    Here are some pictures of the damage. If I use a concrete sealer will I have to seal all the way underground also?






  5. Back To Top    #5

    Join Date
    Apr 2007
    Location
    Ft Lauderdale, Florida
    Posts
    1,455

    Re: Salt Eating Concrete?

    Is there any reason you can think of for the pool water to only be at those areas of degradation? Unless there's pool water leaking out and running off the sidewalk at those specific areas, it does not seem to be from pool water. It may also be possible for your ground (soil) to have a high salt concentration and can have a damaging effect from the bottom up.
    Sean Assam - Sean@teamhorner.com
    National Accounts and Commercial Products Manager
    AquaCal Heat Pumps www.aquacal.com
    AutoPilot Salt Chlorine Generators www.autopilot.com

  6. Back To Top    #6
    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, AZ
    Posts
    3,899

    Re: Salt Eating Concrete?

    To have that much salt left behind, that's a LOT of evaporated pool water. How hard is your tap water in Fresno? Is that spot regularly inundated with pool water?
    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
    Make each day your masterpiece. - John Wooden

  7. Back To Top    #7

    Re: Salt Eating Concrete?

    Okay, so when I first assumed this pool the waterfall leaked through the rocks so bad that this area would flood with inches of water whenever they ran. I converted the pool to salt and sealed the cracks with grout; problem fixed, no more flooding (Summer 2012). This area has not flooded like before the fix. Although there is no more flooding, this area remains moist most of the time. Could be from the sprinklers, could be the pool either from an unfixed waterfall leak or actual pool leak.
    The water here is not that hard compared to LA or other parts of California. I do have a water softener but to my knowledge the autofill is on the bypass lines.
    Speaking to the volume of salt that is in the ground, I believe this to be way excessive. I had taken a water sample to the local pool store and they had stated, on two occasions, that the salt level was around 2000ppm. My original salt content, about a year ago, was almost 4500ppm. To me that is an amazing amount of salt consumption (his interpretation) or loss in my mind. To return the salt to the 4500ppm I added 200 kg of salt (425 kg was my original load in). The other concerning part was that my CYA was around 40, down from 90. My understanding is that you can only lose CYA from actual water removal, not evaporation.
    I've tried the bucket test but can't really seam to tell a significant difference.
    I'm really stressed about the concrete because it is all stamped concrete and quite pricey to fix/replace and my sago palm is ******.

  8. Back To Top    #8
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: Salt Eating Concrete?

    I assumed from you first post that you knew this was pool water puddling or collecting somewhere causing the damage. In either case, I can tell you that salt water and stamped concrete are not generally a good idea.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  9. Back To Top    #9
    Charlie_R's Avatar
    Join Date
    May 2013
    Location
    Mexico, MO
    Posts
    2,156

    Re: Salt Eating Concrete?

    When you did the bucket test, did you turn OFF the autofill?
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

Posting Permissions

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