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Thread: New member greetings and chemical questions.

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    Join Date
    May 2014
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    Tucson/AZ
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    Cool New member greetings and chemical questions.

    Howdy,

    New member of TFP and having decent luck in keeping a clean, clear pool. I've been a pool owner for 12 years and am a little tired of the run-around and green monster experience I've encountered while dealing with the pool store 'experts'. And yeah, they're in complete denial on the CYA vs. FC issue.

    Got a few questions:

    Being a recent convert to TPC I still have substantial amounts 'old school' chemicals around the house to use up.

    1) I started this pool season with a fresh fill. Any problem with using last years trichlor tabs as the sole basis for getting my CYA up to desirable levels?

    2) Any problem with performing occasional shocks with Cal-Hypo until my 12 bags are gone? My current CH is considerably (possibly dangerously??) low for my plaster pool so extra calcium should be welcome. I'm starting to get non-zero CC so a SLAM is in the near future.

    3) It seems that my FC consumption is pretty high albeit my CYA is still low (20 ppm). What is a good target CYA for pools subjected to direct, intense sunlight (Tucson AZ)?



    My FC half-life seems to be 1 day or less.

    FC 1.0 ppm (3.5 yesterday)
    CC 0.5
    TA 140
    pH 7.6
    CYA 20
    CH 150

    Regards,
    BlazeMark
    Tucson AZ 13000 gal, IG, Plaster
    Cartridge Filter, 150 GPM, 150 SF
    Pump hp ?? speed
    Install Date: 1998 Cleaner: Kreepy

  2. Back To Top    #2
    Smykowski's Avatar
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    Gurnee, IL (North Suburban Chi-town)
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    3,065

    Re: New member greetings and chemical questions.

    Welcome to the forum!! Answers in red below....

    Quote Originally Posted by BlazeMark View Post

    1) I started this pool season with a fresh fill. Any problem with using last years trichlor tabs as the sole basis for getting my CYA up to desirable levels? No, provided that you pay attention to the other things trichlor changes. It will monkey with FC, pH, CYA, and TA all at the same time. For this reason we recommend changing one parameter at a time until you get comfortable. If you keep the trichlor dry, it will last forever, so you can use them for vacations/extended time away in the future.

    2) Any problem with performing occasional shocks with Cal-Hypo until my 12 bags are gone? My current CH is considerably (possibly dangerously??) low for my plaster pool so extra calcium should be welcome. I'm starting to get non-zero CC so a SLAM is in the near future. "Shock" is a bad word around here. You wouldn't be shocking, you'd be "appropriately dosing." And you are correct....if your CH is low, there's no reason you can't use cal-hypo - provided you are paying attention to what it's doing to your CH.

    3) It seems that my FC consumption is pretty high albeit my CYA is still low (20 ppm). What is a good target CYA for pools subjected to direct, intense sunlight (Tucson AZ)? Try targeting 50 and see what happens. It seems as though the CYA protection curve isn't linear. There is a tipping point for CYA where all of a sudden, FC drop slows way, way down.



    My FC half-life seems to be 1 day or less.

    FC 1.0 ppm (3.5 yesterday) Keep that FC number up!! Don't let it go below the minimum for your CYA. Either dose more often, or shoot for a higher target to prevent such a drastic drop.
    CC 0.5
    TA 140
    pH 7.6
    CYA 20
    CH 150

    Regards,
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

  3. Back To Top    #3

    Re: New member greetings and chemical questions.

    I agree that it will be best to get the pool into at least minimum ranges first using individual chemicals. Those thing will be more useful later on I think.

    I keep tricolor tablets in stock at all times, buying by the biggest bucket I can store, so that I can use them for vacations. I keep cal-hypo in stock at all times, big bucket, for regular chlorine needs when calcium is a bit low. Note that I pre mix that in water before adding the liquid to the pool for I think my scaled water line was actually hardened cal hypo flakes. This is a bit of a chore so for additions of more than a few days at 10 ppm/day it is easier to use other means and just get the calcium addition done.

    And, welcome to the forum!
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Richard320's Avatar
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    Jan 2010
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    San Dimas, CA (LA County)
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    Re: New member greetings and chemical questions.

    Welcome!

    Quote Originally Posted by BlazeMark View Post
    1) I started this pool season with a fresh fill. Any problem with using last years trichlor tabs as the sole basis for getting my CYA up to desirable levels?
    It will take too long. It'll be mid July before CYA is up high enough. Save them for vacations.

    2) Any problem with performing occasional shocks with Cal-Hypo until my 12 bags are gone? My current CH is considerably (possibly dangerously??) low for my plaster pool so extra calcium should be welcome. I'm starting to get non-zero CC so a SLAM is in the near future.
    Yes. You won't need occasional shocks if you follow our methods. Every pound of Cal-hypo is good for about 5 CH along with the chlorine. 12 lbs will add 60 CH, which makes 210, which is great for your pool. So use it to chlorinate every day until it's gone and switch to bleach. poolmath does allow you to choose cal-hypo when calculating dosages.

    3) It seems that my FC consumption is pretty high albeit my CYA is still low (20 ppm). What is a good target CYA for pools subjected to direct, intense sunlight (Tucson AZ)?



    My FC half-life seems to be 1 day or less.

    FC 1.0 ppm (3.5 yesterday)
    CC 0.5
    TA 140
    pH 7.6
    CYA 20
    CH 150

    Regards,
    It sounds like you've already determined the cause of your chlorine thirst. Target 50 CYA. Just buy the stabilizer and use the sock method and be done with it.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  5. Back To Top    #5

    Re: New member greetings and chemical questions.

    PS Another reason to hold that cal hypo is it really is great for emergency shocking.

    Big things, like someone vomits in the pool. Or like me, one morning you notice vultures at the hot tub. You shoo them away, good to see no dead things left behind... But you notice the bits of... Tissue, body tissue...eeewwww! Trust me, that is the day you will not have 4 jugs of bleach on hand. But 4 bags of cal hypo is just as good! Do check Pool Math for equivalence.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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