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Thread: Sanity check on my numbers

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    Sanity check on my numbers

    Pool is 1 month old and I just wanted to make sure I had a grasp on the testing/balancing.
    Last night's #'s are:

    FC 6
    CC 0
    PH 7.5
    TA 110
    CYA 30
    CH 130

    - I want to bring CYA to 40, so I have a sock with 22oz stabilizer hanging in the pool right now.
    - Shooting for 40 because I'm going to have to use Trichlor pucks in 2 weeks during vacation.
    - Added 50oz of 12.5% last night to get FC to 9.
    I normally lose 4 FC per day with sun & swimmers. cloudy, no swimmers yesterday.
    I'm in full sun, no shade.

    Anything I should change in my plan or what I have been doing?

    Thanks
    ___________________________________________________
    27 x 52 AGP, Hayward EC50 DE filter, 1.5hp 2 spd, 16.7k vinyl
    TF100 w/SpeedStir
    Freshman year in Pool School and BBB.

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    Re: Sanity check on my numbers

    You have it under control.....excellent work!

    My assumption is your water looks great, correct?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Join Date
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    Re: Sanity check on my numbers

    Couple things...

    1: Your FC level is a bit high relative to your CYA level, even if you get that to 40.
    2: Don't forget that the trichlor pucks will add CYA to your water in addition to what you're already adding.
    20,000 gal. free-form plaster on concrete
    Triton DE filter, 1.5HP pump
    Aquabot Elite pool cleaner

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    Re: Sanity check on my numbers

    Good numbers! I would of held off on adding the CYA, as it's already within a good level, and your tri-chlor is going to increase it anyway, but you should still be under 50 with going to 40ppm then adding the tri-chlor. The chlorine level is nice and manageable at those levels also.

    1 month and you have a well balanced pool already? Impressive
    Stuart Murray
    Scotland UK
    UK NPPOC

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    Re: Sanity check on my numbers

    For duraleigh and stuamurr...

    Agreed the FC level isn't so high as to be a problem, but isn't it slightly high for the CYA level?

    And yeah, those ARE good numbers for a new pool!
    20,000 gal. free-form plaster on concrete
    Triton DE filter, 1.5HP pump
    Aquabot Elite pool cleaner

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    Re: Sanity check on my numbers

    Hi flip flop,

    Under 10ppm in an outdoor pool IMHO there is no such thing as too high for a CYA level, maintaining 6ppm FC gives an outdoor pool user a good manageable residual, with decent room for manoeuvre. There is a good argument for chlorine levels being too low versus CYA, but certainly never the other way, and that is a discussion for the deep end threads.

    Regards
    Stuart
    Stuart Murray
    Scotland UK
    UK NPPOC

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    Re: Sanity check on my numbers

    Thanks, Stu!
    20,000 gal. free-form plaster on concrete
    Triton DE filter, 1.5HP pump
    Aquabot Elite pool cleaner

  8. Back To Top    #8

    Re: Sanity check on my numbers

    I thought I should be targeting cya 50 for full sun pool, that's why I was trying for 40 with stabilizer then on to 50 after pucks. Maybe I misunderstood some readings?

    Yes, the water looks great. Couldn't be happier. I'm so glad I found this place. It really takes the mystery out if lol care.

    ___________________________________________________
    27 x 52 AGP, Hayward EC50 DE filter, 1.5hp 2 spd, 16.7k vinyl
    TF100 w/SpeedStir
    Freshman year in Pool School and BBB.

  9. Back To Top    #9

    Re: Sanity check on my numbers

    On one hand, your location does not demand a very high CYA, on the other hand, the DE filter will allow that to slowly drop with backwashing.

    What I do is to calc how much FC I will need for the vacation (2ppm/day) then back into how many trichlor tablets that requires (7/wk). Calculating how much CYA that will add (10ppm/wk) vs the current CYA tells me if this is realistic. This does sometimes keep me running very lean on CYA for several weeks before the anticipated vacation. Sometimes if CYA is not low enough I simply have to get someone to dump jugs of bleach every other day and I do worry about him ruining work clothes with micro splashes of bleach.
    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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    Re: Sanity check on my numbers

    I thought I should be targeting cya 50 for full sun pool, that's why I was trying for 40 with stabilizer then on to 50 after pucks. Maybe I misunderstood some readings?
    No, your thinking is correct. I would continue doing what you are doing.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  11. Back To Top    #11

    Re: Sanity check on my numbers

    Ok, Thanks everyone.

    ___________________________________________________
    27 x 52 AGP, Hayward EC50 DE filter, 1.5hp 2 spd, 16.7k vinyl
    TF100 w/SpeedStir
    Freshman year in Pool School and BBB.

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