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

Thread: Saturation Index with Vinyl Liner Pool?

  1. Back To Top    #1

    Join Date
    May 2012
    Location
    Jackson, TN
    Posts
    24

    Saturation Index with Vinyl Liner Pool?

    In my education process to have total control over our pool, I've been reading up about CSI and how it changes with TA, CH, pH, and water temp.

    My numbers are currently:

    FC 4.0
    CC 0.0
    pH 7.6
    TA 70
    CH 190
    CYA 55
    SWG @ 20% output

    Water temp is around 83deg and climbing daily so my CSI is right at -0.1 and should end up right at 0.0 once we get into full summer weather so I'm not changing anything right now.

    I know the CSI is important with gunite pools and such but does it really matter with a vinyl lined pool?

    Still learning and absorbing all the great info on this site!
    In-ground, vinyl pool, 26,000 gals
    Hayward Sand Filter, Aquarite SWG, Hayward Ecostar Pump

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Saturation Index with Vinyl Liner Pool?

    With a vinyl liner pool it isn't usually worth even thinking about CSI unless you have high CH fill water and high evaporation rates. Most people can simply keep their levels within the recommended ranges and leave it at that. That said, no matter what kind of pool you have you don't want the CSI getting above about 0.5. That will lead to calcium scaling. If you have a vinyl liner pool it is completely fine to have CSI very negative, and preferred if you can keep it at least a little negative.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Join Date
    May 2012
    Location
    Jackson, TN
    Posts
    24

    Re: Saturation Index with Vinyl Liner Pool?

    Thanks Jason. That's what I was thinking.
    In-ground, vinyl pool, 26,000 gals
    Hayward Sand Filter, Aquarite SWG, Hayward Ecostar Pump

  4. Back To Top    #4
    Defgufman's Avatar
    Join Date
    Mar 2015
    Location
    Savannah GA
    Posts
    577

    Re: Saturation Index with Vinyl Liner Pool?

    I'm glad I read this, my csi is -0.3, but I was thinking it shouldn't matter with a vinyl pool. Thanks
    Inground 13,200 gal Vinyl, Pentair 3/4 hp pump, Pentair Sand Dollar filter, Polaris 280

    Pool School, Pool Math, CYA to FC ratio chart, Testing Kits

  5. Back To Top    #5

    Join Date
    Apr 2015
    Location
    Knoxville, TN
    Posts
    64

    Re: Saturation Index with Vinyl Liner Pool?

    How in the world is your pool that warm? I'm in east tn and my pool is 55 degrees.
    Sand filter
    Salt Generator
    25000 gallon IG Vinyl

  6. Back To Top    #6
    Saturn94's Avatar
    Join Date
    Mar 2015
    Location
    Virginia
    Posts
    461

    Re: Saturation Index with Vinyl Liner Pool?

    Quote Originally Posted by Rere View Post
    How in the world is your pool that warm? I'm in east tn and my pool is 55 degrees.
    Check the date on that post.
    20k IG vinyl liner/Aqua Rite SWCG, T-15 cell/Hayward Pro Grid 6020 DE filter/Polaris 280 with booster pump/Hayward Superpump 1 hp/city water/pool installed March 2004

  7. Back To Top    #7

    Join Date
    Apr 2015
    Location
    Knoxville, TN
    Posts
    64

    Re: Saturation Index with Vinyl Liner Pool?

    Quote Originally Posted by Saturn94 View Post
    Check the date on that post.
    Well I'm a dork! Newbie mistake.... Can you tell I was jealous of those warm temps just a few hours away?
    Sand filter
    Salt Generator
    25000 gallon IG Vinyl

  8. Back To Top    #8
    Defgufman's Avatar
    Join Date
    Mar 2015
    Location
    Savannah GA
    Posts
    577

    Re: Saturation Index with Vinyl Liner Pool?

    Our pool hit 82 yesterday....solar cover and Savannah Georgia sun.
    Inground 13,200 gal Vinyl, Pentair 3/4 hp pump, Pentair Sand Dollar filter, Polaris 280

    Pool School, Pool Math, CYA to FC ratio chart, Testing Kits

Posting Permissions

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