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Thread: Cl level sanity check please

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    Cl level sanity check please

    We have a 17,000 liter above ground vinyl lined pool, located inside of a 'green house' to keep the bugs off us.

    This year I switched to Borax, 12% liquid Cl, and muriatic acid.

    Came back from a 5 day trip to a green pool. Took a sample into the local Surfside pool place to double check the ph level as I have had problems before with high Cl levels affecting the ph test, and they advised me I needed to add 20 liters ( yes, that is 20 not 2.0 ) of the 12% liquid Cl to go from 3ppm to 10ppm. And that liquid Cl was not as good as Dazzle Ultra Shock.

    This sounded absolutely nuts to me. The pool calculator indicates the free Cl would be about 150 ppm if I did that.

    Took another sample into the Dolphin pool store and the only number the 2 places agreed on was the ph of 7.6.

    Both places indicated that Borax shouldn't be used..... And that I needed to quickly get my Ca from 130 or 150 (depending on which test you believe) up to 200. In a vinyl pool?

    I should know better that to go into these places!

    Anybody else get advice like this?

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

    Re: Cl level sanity check please

    Welcome to TFP!

    It happens all the time. Hang around and read stories from people who have just discovered TFP and you will hear the strangest things that pool clerks tell people. One of my favorites was telling someone to add 12 lbs of PH Down and 10 lbs of PH Up (which does more or less nothing other than pay the pool store money).
    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
    svenpup's Avatar
    Join Date
    Nov 2009
    Sacramento, CA

    Re: Cl level sanity check please

    It sounds like you already know the answer.

    I get 3.5 liters for 7ppm increase. Dazzle Ultra Shock (whatever that is) is not "better" than liquid chlorine, and may be worse depending on what is is and what your numbers are.

    Borax is fine to raise pH, which you don't need to do.

    Your CH is fine. Low CH is irrelevant to vinyl pools (High CH is bad for any pool).
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock ('s a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

  4. Back To Top    #4

    Join Date
    Jun 2010
    Glendale, CA

    Re: Cl level sanity check please

    Buying a TF-100 test kit was the single biggest money saving move I've made this year. It'll free you from all that pool store madness and just put you in the drivers seat.

    You can bet the green is due to low FC levels. When you say "high" what is that? Our pool store was telling us 3ppm was too high - with CYA of 150. Our pool turned a lovely shade of emerald

    No one is going to acknowledge Borax. No manufacturer specifies borax for use in pools and regulations (for anything really) get written such that products cannot be used in ways unspecified by the manufacturer. The only regs that exist are for public pools, We live in a litigious society .... what's a pool store to do?

    They do have several products in the store that are chemically similar though, as in they contain borates. I doubt they'd tell you not to use those.

    As for shocking at 150ppm FC... It'll kill the algae.

    Clearly you already know you're getting bad advice.
    16K Gal Plaster | Compupool SWG | Intelliflow VF | TF-100

  5. Back To Top    #5

    Join Date
    Jan 2009
    Cupertino, CA

    Re: Cl level sanity check please

    You'll see borates suggested sometimes for spas, but I doubt any commercial joint would suggest it for a pool. Although I believe one or two of the freelance service guys who hang around here will do it.
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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