Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 12 of 12

Thread: Bathtub Ring

  1. Back To Top    #1

    Join Date
    Sep 2011
    Location
    Denton, Texas
    Posts
    38

    Bathtub Ring

    What is the best (easiest) way to solve the bathtub ring issue? There is a fine white line (calcium?) that goes all the way around my tile at the water line. Acid does not seem to clean it very well. Someone suggested bead blasting...do not want to do that!
    30,000 gal in-ground, Stonescapes Tahoe Blue, DE filter, Pentair WFE-30 filter pump, Saltwater Generated Chlorine.

  2. Back To Top    #2

    Join Date
    Jun 2011
    Location
    Long Beach, CA
    Posts
    2,671

    Re: Bathtub Ring

    You could try a pumice stone. Try to find a softer one and test it in a small area first to make sure it works the way you want.
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
    Hayward Aqua Rite T-15 SWCG, Jandy LXi 400k BTU NG heater, 350 sq.ft. of Sun Star solar panels, TF-100 Test Kit, Dolphin s300i Cleaner
    Test Kits . Pool Math . Chlorine/CYA Chart . The SLAM Process

  3. Back To Top    #3

    Join Date
    Sep 2011
    Location
    Denton, Texas
    Posts
    38

    Re: Bathtub Ring

    Quote Originally Posted by ping View Post
    You could try a pumice stone. Try to find a softer one and test it in a small area first to make sure it works the way you want.
    That is a good idea. I am surprised that 100% acid did not clean it off the tile.
    30,000 gal in-ground, Stonescapes Tahoe Blue, DE filter, Pentair WFE-30 filter pump, Saltwater Generated Chlorine.

  4. Back To Top    #4


    Join Date
    Sep 2014
    Location
    Bakersfield, CA
    Posts
    155

    Re: Bathtub Ring

    TXFlyGuy, a couple of months ago I adjusted my autofill to drop the pool level by 1" to see if the skimmer would work better. To my surprise I found a 3/8" wide, grey/white ring around the pool tile at the old water level. The ring had no thickness and strong acid had no effect on it. I tried pummice stone and that wouldn't shift it either. The really annoying thing was that I couldn't see the ring when it was wet so had to wait for it to dry to see if what I had done worked.

    Eventually I gave up and adjusted the autofill back up to its previous level.

    I don't know if my description of the bathtub ring matches yours, but if anyone has any ideas as to what this deposit might be, they would be much appreciated.
    Cheers, Peter
    20,000 gal, 52'x17' kidney shaped IG, Pebble Tec, IntelliPro P6E6VS4H-209L pump. Intellichlor IC40 SWG.
    300 sf Sta-Rite System 3 cartridge filter. Poolvergnuegen 4-wheel suction pool cleaner. TF-100 test kit.

  5. Back To Top    #5

    Join Date
    Sep 2011
    Location
    Denton, Texas
    Posts
    38

    Re: Bathtub Ring

    Quote Originally Posted by prs View Post
    TXFlyGuy, a couple of months ago I adjusted my autofill to drop the pool level by 1" to see if the skimmer would work better. To my surprise I found a 3/8" wide, grey/white ring around the pool tile at the old water level. The ring had no thickness and strong acid had no effect on it. I tried pummice stone and that wouldn't shift it either. The really annoying thing was that I couldn't see the ring when it was wet so had to wait for it to dry to see if what I had done worked.

    Eventually I gave up and adjusted the autofill back up to its previous level.

    I don't know if my description of the bathtub ring matches yours, but if anyone has any ideas as to what this deposit might be, they would be much appreciated.
    Yes, that is my situation exactly. We did a grout "touch up" on the entire pool. Saw the white line (bathtub ring) after we drained some water. Guess I just need to keep the pool filled up to hide it! The pool guy who did the grout work said the only way to remove it would be to bead blast.
    30,000 gal in-ground, Stonescapes Tahoe Blue, DE filter, Pentair WFE-30 filter pump, Saltwater Generated Chlorine.

  6. Back To Top    #6


    Join Date
    Sep 2014
    Location
    Bakersfield, CA
    Posts
    155

    Re: Bathtub Ring

    My pool was bead blasted in March to remove a huge calcium tide mark that had accumulated under previous ownership. There was no grey/white ring at that time, so this one was formed in about six months. If a pummice stone can't remove it I'm not sure a bead blast would do it either.

    We both have an SWG, I wonder if that has something to do with it?
    Cheers, Peter
    20,000 gal, 52'x17' kidney shaped IG, Pebble Tec, IntelliPro P6E6VS4H-209L pump. Intellichlor IC40 SWG.
    300 sf Sta-Rite System 3 cartridge filter. Poolvergnuegen 4-wheel suction pool cleaner. TF-100 test kit.

  7. Back To Top    #7

    Join Date
    Sep 2013
    Location
    Dallas-Ft. Worth Metroplex, TX
    Posts
    810

    Re: Bathtub Ring

    Can you show a picture of the ring? I had a lot of leftover grout on my tile that came off with 50%.
    14K Freeform Gunite w/60% Blue Quartz plaster, Quad DE filter, Intelliflo VS Pump + Booster for Cleaner, Aquacal Heat Pump

  8. Back To Top    #8


    Join Date
    Sep 2014
    Location
    Bakersfield, CA
    Posts
    155

    Re: Bathtub Ring

    A picture is not possible as the ring is now under water. However it is greyish white in color, slightly darker than a calcium deposit. It has no thickness, if you run your finger over it you can't even feel it. The acid I used easily removed calcium deposits but wouldn't touch this stuff.
    Cheers, Peter
    20,000 gal, 52'x17' kidney shaped IG, Pebble Tec, IntelliPro P6E6VS4H-209L pump. Intellichlor IC40 SWG.
    300 sf Sta-Rite System 3 cartridge filter. Poolvergnuegen 4-wheel suction pool cleaner. TF-100 test kit.

  9. Back To Top    #9

    Join Date
    Jul 2011
    Location
    Arizona & California
    Posts
    772

    Re: Bathtub Ring

    The reason that acid doesn't always work well on scale above the water line is because it is often not 100% calcium carbonate. The white residue also contains other salts and elements (material or compounds) that aren't dissolved by an acid.

  10. Back To Top    #10
    JayBauman's Avatar
    Join Date
    Sep 2014
    Location
    Katy, TX
    Posts
    617

    Re: Bathtub Ring

    I've always wondered if household cleaner like CLR work in situations like this. Has anyone tried it?
    23' x 37' IG 18.5k gallon SWG w/ raised spa, Build Thread -->Here
    Wet Edge® Pearl Matrix®, Hayward® SwimClear™ 525 ft², Hayward® Goldline Controls® PS-8
    4x Hayward® TriStar™ pumps, Paramount PCC2000® ICS, TF-100 w/Speedstir

  11. Back To Top    #11

    Join Date
    Jul 2012
    Location
    Central Texas
    Posts
    436

    Re: Bathtub Ring

    I've had the same things. The pumice stones Walmart sells work great, but you have to scrub ( and sometimes scrub and scrub and then scrub again). Does not work on just a few semi casual passes over it. Also, since the pumice wears down, the bottom of your pool will be gritty until you either vacuum it or let your cleaner get it up over time.

    For really bad areas around our sconces I used a commercial product which was essentially acid in a foam that hardened and ate at it over time, (30 min) then you came back and wiped it off with water. That didn't take care of everything but it softened it up a lot and made the pumice stones more effective.
    Central TX / 12K GAL / IG / SWG / DE filter / Pentair SVRS & 3 swim jet pumps / Spa bench and jets / Single body of water / No heater.

  12. Back To Top    #12

    Join Date
    Sep 2013
    Location
    Dallas-Ft. Worth Metroplex, TX
    Posts
    810

    Re: Bathtub Ring

    You guys have me paranoid about this bathtub ring. Is it from neglect? Seems to me weekly brushing should keep buildup like this at bay.
    14K Freeform Gunite w/60% Blue Quartz plaster, Quad DE filter, Intelliflo VS Pump + Booster for Cleaner, Aquacal Heat Pump

Posting Permissions

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