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Thread: Who to believe

  1. Back To Top    #1

    Who to believe

    First test with TF100 CH 400 - as a double check had pool place test water they said I need to add 10 pounds of calcium?

    Here are the details:

    17K gal
    DE filter
    AG
    MY RESULTS:
    FC 27
    CC 0
    TC 27
    pH 7.2
    T/A 200
    CH 400
    CYA 85

    I shocked pool yesterday.
    Caretaker for:
    24k gal fiberglass IGP Big Blue Key by Blue Hawaiian, Hayward sand filter 200lb, 3/4 HP pump, power cover.

  2. Back To Top    #2

    Re: Who to believe

    Did the pool store actually tell you what their result was for their test?

    If I were you, I would test it myself one more time and if it still read that high, take a sample to another pool store for testing.

    Have you been getting calcium scaling or build up anywhere?
    IG ~15,000 Gallon Plaster Pool with Attached Spa
    Hayward SwimClear C4025 - 150GPM, Cartridge
    2hp Pump 1.1 Service Rating
    Direct sunlight most of the day

  3. Back To Top    #3
    reebok's Avatar
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    Re: Who to believe

    above ground means vinyl so your problem with high ch would be scaling. but your ph is on the low end so I doubt you're having that problem. you don't have a salt water generator do you?
    p.s. believe your results. my ch is 625 but the pool stores always tell me it's 400.
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    Join Date
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    Re: Who to believe

    Don't believe the pH when FC is that high.

    What was the reason for shocking?
    --paulr
    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

  5. Back To Top    #5
    reebok's Avatar
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    Re: Who to believe

    good catch. I saw a post from JasonLion that said high fc makes ph read falsely high. I can't find it now, but fpm says it in this thread, near the end.
    low-ph-high-ta-almost-zero-fc-help-t12923.html
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

  6. Back To Top    #6

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,085

    Re: Who to believe

    First off, welcome to TFP!

    For sure with the high CH you do not want to add more calcium which is what the pool store said to do -- at least if you CH reading is correct. 10 pounds of calcium hardness increaser would raise the CH by 48 to 64 ppm depending on the type of calcium chloride that is used. It sounds like they think your CH is somewhere around 250 and are thinking it should be 300, but that's just a guess on my part.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  7. Back To Top    #7

    Re: Who to believe

    Quote Originally Posted by PaulR
    Don't believe the pH when FC is that high.

    What was the reason for shocking?
    --paulr
    I just opened the pool
    Caretaker for:
    24k gal fiberglass IGP Big Blue Key by Blue Hawaiian, Hayward sand filter 200lb, 3/4 HP pump, power cover.

  8. Back To Top    #8

    Join Date
    Jan 2009
    Location
    Cupertino, CA
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    Re: Who to believe

    So, the water is clear? Excellent.

    I hope you're using liquid chlorine or bleach; your calcium and CYA levels are too high to want to use anything else.
    --paulr
    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

  9. Back To Top    #9
    frustratedpoolmom's Avatar
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    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,963

    Re: Who to believe

    Calcium levels as low as 50 are perfectly fine for an above ground pool. They are just trying to sell you chemicals.

    Have you read Pool School?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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