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Thread: New to TFP need advice

  1. Back To Top    #1

    Join Date
    Jul 2015
    Location
    HARRISBURG NC
    Posts
    11

    New to TFP need advice

    Hello all my first question , Thanks in advance to any replies
    My CYA is too high. I have back washed to waste multiple times bottom of skimmers and fill with fresh water from well.
    How much water should I dump ?
    I just got a Tf 100 kit with below results
    CYA-beyond 100 just guessing 400
    Chrorine - 0-1
    ALK -400 +
    PH- 8.2
    25 year old construction
    20x40 In vinyl 36k gal
    2 skim 3 returns
    Pentair super flow VS, Sand Filter
    TF 100 test kit

  2. Back To Top    #2
    Isaac-1's Avatar
    Join Date
    May 2010
    Location
    SW Louisiana
    Posts
    6,711

    Re: New to TFP need advice

    Have you tried the extended CYA test Extended Test Kit Directions This should give us an idea of how high your CYA really is, if it really is at 400 then you will need to replace about 90% of your water, since you have a vinyl pool you will want to do a series of partial drains so as to always keep about 1 ft of water in the shallow end to prevent the liner from lifting and getting wrinkles. I would suggest retesting after each partial drain / refill cycle, repeated as needed until your CYA gets below 50 ppm.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
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  3. Back To Top    #3

    Join Date
    Jul 2015
    Location
    HARRISBURG NC
    Posts
    11

    Re: New to TFP need advice

    Thanks for advise
    I added 1/2 jug 12.5 % bleach pm. Then retested this am using extended CYA test. results from pool math suggest draining 60%. I also need to lower PH.

    Can I drop CYA by backwashing to waste say over 4-5 days days ? and should I adjust PH now ? I would like to keep swimming
    CYA- 100
    PH- 8.2
    Alk- 140
    Chloro - 4
    CC - .5
    25 year old construction
    20x40 In vinyl 36k gal
    2 skim 3 returns
    Pentair super flow VS, Sand Filter
    TF 100 test kit

  4. Back To Top    #4
    Texas Splash's Avatar
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    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,947

    Re: New to TFP need advice

    I concur with Isaac-1 in that a significant drain is the best option as soon as you can do it. Until then you are kind of wasting chemicals that will get flushed-out anyways. Yes, backwashing to waste will reduce CYA overtime, but that's a lot of backwashing. So if you need to give everyone some swim time, go ahead and adjust pH for now, but then plan on doing a significant water exchange as soon as possible. Just in case you've never done this, here's the dilution testing method:
    CYA Dilution Testing:
    Add pool water to bottom of sticker.
    Add tap water to top of sticker.
    Shake.
    Pour out half so mixture is to bottom of sticker.
    Add reagent to top of sticker.
    Shake.
    Test outside with back to sun and tube at waist level.
    Pour back and forth a few times to see if you get the same result.
    Double the result.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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  5. Back To Top    #5

    Join Date
    Jul 2015
    Location
    HARRISBURG NC
    Posts
    11

    Re: New to TFP need advice

    Thanks, Texas Splash and Isaac-1
    I hoping there was an alternative to drain so much water. I did use dilution method to get an accurate CYA number.
    Glad I wised up and started my own testing. As pool store continued to sell me things I did not need even when i pointed out high levels of CYA on their test results. They advised to add Phosphate.

    Thanks again for your responses and to TFP

    25 year old construction
    20x40 In vinyl 36k gal
    2 skim 3 returns
    Pentair super flow VS, Sand Filter
    TF 100 test kit

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