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Thread: Switching from hth tablets to TFPC

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    Join Date
    Jun 2015
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    Eastern Nebraska
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    Switching from hth tablets to TFPC

    Hello all and thanks again for all of the wonderful information on this site!!

    I started with a small plastic kiddie pool, then a 10' easy set, then a 12' easy set and this year a 15' x 42" Intex metal frame pool. I figured I'd start taking chemistry seriously instead of just using the tabs in the floater and shocking every Sunday night as I'm sure I'll continue to go larger. I have been using 1" hth chlorinating tablets to maintain chlorine level, 4 per day. I purchased bleach but I will probably use up my shock pack of 47.6% calcium hypochlorite first as I hate throwing stuff away and then save the 1" tablets for my 42" kiddie pool foot bath that the ladder sits in.

    Pool was set up Memorial weekend and water is currently sparkling clear.

    I just bought a 14" Intex sand filter but now realize I need fittings so that is still on hold until the fittings arrive, hopefully by the weekend. I also bought a K-2006 complete FAS-DPD test kit.

    Here are my results:
    FC = 2.2
    CC = 0
    pH = 7.6
    Alk = 170
    CYA = less than 30
    Hardness = 100

    I have 16oz of the shock 'n swim (47.6% calcium hypochlorite) to use up before starting with the bleach. Per the pool calculator I added 1 ounce today. If that trend continues the pack will be gone in about two weeks or so.

    Am I on the right path? Will this hth shock 'n swim raise the CYA much or should I go buy some stabilizer also?
    16,000 Gallon, AG Intex Ultra Frame, Intex 3000 Sand Filter System, Intex SWG, Taylor K-2006 FAS-DPD

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    Mod Squad JVTrain's Avatar
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    Feb 2014
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    Central Minnesota
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    Re: Switching from hth tablets to TFPC

    Cal-hypo will not raise your CYA, it will only raise your FC and CH (hardness). I would add more stabilizer to get it to 40 ppm and then continue with bleach after that.

    Congrats on the great test kit and a great headstart on keeping the pool sparkling!

    You can use up the rest of the cal-hypo also as your CH is low and CH is not critical for vinyl/AG pools. Just keep in mind once your CYA is 40 ppm, your FC minimum is 3 ppm.
    Last edited by JVTrain; 06-16-2015 at 04:34 PM. Reason: cal-hypo use
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Join Date
    Jun 2015
    Location
    Eastern Nebraska
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    Re: Switching from hth tablets to TFPC

    Quote Originally Posted by JVTrain View Post
    Cal-hypo will not raise your CYA, it will only raise your FC and CH (hardness). I would add more stabilizer to get it to 40 ppm and then continue with bleach after that.

    Congrats on the great test kit and a great headstart on keeping the pool sparkling!

    You can use up the rest of the cal-hypo also as your CH is low and CH is not critical for vinyl/AG pools. Just keep in mind once your CYA is 40 ppm, your FC minimum is 3 ppm.
    Thanks! I just noticed on the bag it says "other ingredients 52.4%" and then in the directions it says "won't over stabilize your pool" which led me to think it may add CYA. I'll grab some stabilizer from Menards on the way home from work tomorrow.

    Thanks again!
    16,000 Gallon, AG Intex Ultra Frame, Intex 3000 Sand Filter System, Intex SWG, Taylor K-2006 FAS-DPD

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    Join Date
    Jun 2015
    Location
    Eastern Nebraska
    Posts
    15

    Re: Switching from hth tablets to TFPC

    Today I added 22 oz by volume of 2,4,6 Trihydrozy-s-triazine 100%

    It says it lowers pH, since the pool is currently 7.6 I'm hoping it will all work out great. I'll test CYA in 7-10 days.
    16,000 Gallon, AG Intex Ultra Frame, Intex 3000 Sand Filter System, Intex SWG, Taylor K-2006 FAS-DPD

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