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Thread: MCase with TFTK results

  1. Back To Top    #1

    Join Date
    Mar 2009
    Location
    Galveston, Tx
    Posts
    16

    MCase with TFTK results

    FC = 14, pH 7.8 TA 160, CH 350, CYA 90, CSI 0.42
    1. I'm tying to figure out if I need to try to adjust either the TA or the CYA. In the info about elevated TA there is a warning about simply hitting a target level. My pH doesn't seem to move very much and according to the pool calculator the CSI is 0.42 which does not seems problematic. Incidentally, my pool has two fountains for aeration.

    2. I need help reading the Chlorine CYA chart. What does the Shock FC1 column mean?

    3. I will happily convert to using liquid bleach and other household products to balance the pool. (I love this site.)

    My only other concern is with the stains from Ike last fall and they are fading pretty well.
    23 K Gal
    DE
    IG
    gunite
    2 Hp Pentair pump
    Filter: DE Nautilis FNS 60

  2. Back To Top    #2
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    Re: MCase with TFTK results

    IF you are currently using trichlor tablets then your TA is fine and your pH will be stable. However, this is why your CYA is so high and it will only climb higher. If you switch to an unstabilized chlorine source like bleach then you will need to lower your TA substantially.

  3. Back To Top    #3
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,963

    Re: MCase with TFTK results

    Quote Originally Posted by mcase
    FC = 14, pH 7.8 TA 160, CH 350, CYA 90, CSI 0.42
    1. I'm tying to figure out if I need to try to adjust either the TA or the CYA. In the info about elevated TA there is a warning about simply hitting a target level. My pH doesn't seem to move very much and according to the pool calculator the CSI is 0.42 which does not seems problematic. Incidentally, my pool has two fountains for aeration.

    2. I need help reading the Chlorine CYA chart. What does the Shock FC1 column mean?
    3. I will happily convert to using liquid bleach and other household products to balance the pool. (I love this site.)

    My only other concern is with the stains from Ike last fall and they are fading pretty well.
    Welcome!

    That's your shock level - for a CYA of 90 your shock level according to the chart is 35. You should always, and I do mean always keep the FC above 7 (your minimum target) to prevent an algae bloom. Between 7-10 is a good, daily regular number. Shoot for 10 on the hot days, and when the bather load is up.

    You can consider doing a partial drain to lower the CYA to a more managable number, (you can see the recommended levels article in Pool School). The way to lower CYA is through water replacement. Lower CYA means lower corresponding chlorine levels....In the meantime, use bleach additions, daily, to maintain your minimum FC. Have you checked out the Pool Calculator - this tells you how to calculate how much bleach and other chems you will need to add for your pool.

    Since you have a considerable source of aeration, and if you plan to stop using pucks, you may experience your PH rise frequently. If you notice it creeping up and constant additions of acid are necessary, you can lower your TA which will make the PH more stable. Read about How To Lower Total Alkalinity in Pool School.

    Hope this helps....
    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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