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Thread: FC, pH always constant

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    Join Date
    Jun 2015
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    Phoenix, AZ
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    FC, pH always constant

    I have checked all pool chemistry values (TF-100) diligently for the last week, since we filled our new pool..
    Initially, the values were all over the place, but after balancing, I am noticing the following:

    For the last 2 days, the values of FC = 6, CC = 0 & pH = 7.5 are consistantly constant throughout the day.

    We had kids swim in the water prior to that and I had to add some bleach & acid to bring the levels above.. but since then I have not added anything to the pool.
    It has been cloudy for the last couple of days (a rarity in PHX) - maybe this is why FC is constant?
    2015 build (link)| 16.5 K gal | Salt Water | IG rect | 35'x16' | 568 sf | 105 ft peri | depth 3'-5' | PV3 in-floor | 2 Venturi skimmers | MDX+SDX drains | T-CELL-15 SWG | Hayward Ecostar VS pump | Hayward 7220 DE Filter | Aqua Cal Icebreaker Heat / Cool pump SQ166 | Hayward Sense & Dispense PH Controller| Omnilogic | Pebble Sheen Blue Surf | Ultra UV | Stenner acid pump | Coverstar Automatic | TF-100

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    Re: FC, pH always constant

    The T-cell 15 listed in your sig is an SWG, right?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: FC, pH always constant

    Quote Originally Posted by duraleigh View Post
    The T-cell 15 listed in your sig is an SWG, right?
    Yes, Dave.. but it is turned off ... I wanted to turn it on after everything balances out..
    2015 build (link)| 16.5 K gal | Salt Water | IG rect | 35'x16' | 568 sf | 105 ft peri | depth 3'-5' | PV3 in-floor | 2 Venturi skimmers | MDX+SDX drains | T-CELL-15 SWG | Hayward Ecostar VS pump | Hayward 7220 DE Filter | Aqua Cal Icebreaker Heat / Cool pump SQ166 | Hayward Sense & Dispense PH Controller| Omnilogic | Pebble Sheen Blue Surf | Ultra UV | Stenner acid pump | Coverstar Automatic | TF-100

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    Re: FC, pH always constant

    Cloudy weather helps some of the FC loss but not enough that you see no loss in 48 hours.

    Are you testing so that you continue to add drops until there is NO further change in the sample? Often, folks will stop the test when the change is not yet complete.

    My guess is it's just one of those things and you may see a 2-3 ppm drop (or more) today.....assuming you are testing as above.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: FC, pH always constant

    Thanks, Dave. I will carefully check this evening when I get home.
    I think we are getting the Sense and Dispense hooked up today as well as the Stenner pump.
    2015 build (link)| 16.5 K gal | Salt Water | IG rect | 35'x16' | 568 sf | 105 ft peri | depth 3'-5' | PV3 in-floor | 2 Venturi skimmers | MDX+SDX drains | T-CELL-15 SWG | Hayward Ecostar VS pump | Hayward 7220 DE Filter | Aqua Cal Icebreaker Heat / Cool pump SQ166 | Hayward Sense & Dispense PH Controller| Omnilogic | Pebble Sheen Blue Surf | Ultra UV | Stenner acid pump | Coverstar Automatic | TF-100

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