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Thread: What is this line and how do I get rid of it?

  1. Back To Top    #1

    Join Date
    Nov 2015
    Location
    Katy, TX
    Posts
    46

    What is this line and how do I get rid of it?

    This white line appears just above the water line in my hot tub and is most prominent when the hot tub is on I.e. The water is hot - see photo

    I do not see this around my pool.

    Image1466815474.790321.jpg

    Test results from today:
    pH 7.7
    FC 6.5
    CC 0.0
    CH 225
    TA 80
    CYA 60

    Can someone advise what causes this and how to get rid of it?

    Thanks
    Dave


    In Ground Gunite with PebbleTec finish, 16.5ft x 35ft, 18600 gallons
    Elevated Spa with spillway
    Pentair Cartridge Filter, Pentair Pumps and Controller
    TF-100 Test Kit
    Located in Katy, TX

  2. Back To Top    #2
    BoDarville's Avatar
    Join Date
    Jun 2012
    Location
    DFW, Texas
    Posts
    3,840

    Re: What is this line and how do I get rid of it?

    Since the white line is fairly level, it looks like calcium deposits. Although your CH level is in-range (and you do not want to lower it given your pool surface), I would lower the pH slightly (say to 7.5 at first) and see if that helps fade the line.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

  3. Back To Top    #3

    Join Date
    Nov 2015
    Location
    Katy, TX
    Posts
    46

    Re: What is this line and how do I get rid of it?

    Quote Originally Posted by BoDarville View Post
    Since the white line is fairly level, it looks like calcium deposits. Although your CH level is in-range (and you do not want to lower it given your pool surface), I would lower the pH slightly (say to 7.5 at first) and see if that helps fade the line.
    That is why this forum is so great. I would never have thought of that. I was planning on lowering pH a little anyway as my grand daughter and I have been having some stingy eyes that I was attributing to high pH

    Thanks for the help


    In Ground Gunite with PebbleTec finish, 16.5ft x 35ft, 18600 gallons
    Elevated Spa with spillway
    Pentair Cartridge Filter, Pentair Pumps and Controller
    TF-100 Test Kit
    Located in Katy, TX

  4. Back To Top    #4
    BoDarville's Avatar
    Join Date
    Jun 2012
    Location
    DFW, Texas
    Posts
    3,840

    Re: What is this line and how do I get rid of it?

    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

  5. Back To Top    #5

    Join Date
    Jun 2016
    Location
    Martinez, CA
    Posts
    207

    Re: What is this line and how do I get rid of it?

    Is it real stone or ceramic tile? If ceramic, some diluted muratic acid on a rag or brush will probably take it right off if the lowering of pH isn't helping. Making sure you wear proper protective gear of course.
    18,000 gunite pool/spa combo. Pebble tec, iaqualink rs8, cl580 filter, aquapure 1400, 400k btu lx heater, 10 solar panels, jandy 1hp, 1 1/2hp, and 2hp stealth pumps for circ, spa, waterfall

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