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Thread: Chlorine Levels question

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    Chlorine Levels question

    I have a 4 mth season (May 15 to Sep 15) and this year's water quality has been great due to the TFP advice. (thanks again)
    I usually use chlorox, but also keep cal-hypo powder around and tri-chlor pucks that I use occasionally.
    in the beginning of the season if CYA is low I will use the pucks but will stop using once CYA levels get above 40-50.

    over a week ago I notice a slight trace of combined chlorine (less than .5) so shocked for the first time since opening, with 2 gallons of chlorox and couple pounds of cal-hypo....I also put the pucks back in my floater since CYA was still around 40.

    with only the floater supplying chlorine my chlorine level has been between 4 and 6 for 8 days.

    this seems unusual to me to not have to add chlorox for this many days,,wondering if its expected behavior since my CYA levels are good?
    also, anything wrong with using 3 types of chlorine in anyone's opinion? (I know not to combine them in a container)

    weather has been 50% cloudy, around 80 degree highs.
    24K gal, plaster, concrete decking, cantelivered coping, 20 years old, raised attached stone spa - 1 1/2 HP purex triton pump, 3 yr old 48 sq ft Pentair DE filter with multiport, Polaris 380 w/pump, 2 yr old Pentair mastertemp 400k heater - live in southeastern PA outside phila.

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    linen's Avatar
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    Re: Chlorine Levels question

    Quote Originally Posted by jp4120
    over a week ago I notice a slight trace of combined chlorine (less than .5) so shocked for the first time since opening
    If if the CC cleared with one drop when using the FAS-DPD test, then don't worry about it. You were using the FAS-DPD chlorine test(not to be confused by the DPD chlorine test)?

    Quote Originally Posted by jp4120
    shocked for the first time since opening
    On tfp, SLAMing (formerly known on here as shocking) a pool is a process that is done when needed and not a one time event. See: http://www.troublefreepool.com/pool-...king_your_pool

    Quote Originally Posted by jp4120
    with only the floater supplying chlorine my chlorine level has been between 4 and 6 for 8 days.

    this seems unusual to me to not have to add chlorox for this many days,,wondering if its expected behavior since my CYA levels are good?
    How many tabs have you used? What size are the tabs?

    Quote Originally Posted by jp4120
    anything wrong with using 3 types of chlorine in anyone's opinion? (I know not to combine them in a container)
    Using too much cal-hypo can eventually lead to scaling. As you know, using too much trichlor can lead to high cya levels. It also lowers the ph and TA since it is acidic. Dichlor powder/granuales also add cya. Bleach/liquid chlorine is best since all it adds is a small amount of salt which is a non-issue.

    Post a full set of test results and we can give you some suggestions. FC, CC, ph, TA, CH, cya
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Chlorine Levels question

    I fill a frog floater with 5 tri-chlor pucks

    current readings
    FC = 4.0
    CC = 0
    PH = 7.4
    TA = 80
    CH = 250
    CYA = 40
    24K gal, plaster, concrete decking, cantelivered coping, 20 years old, raised attached stone spa - 1 1/2 HP purex triton pump, 3 yr old 48 sq ft Pentair DE filter with multiport, Polaris 380 w/pump, 2 yr old Pentair mastertemp 400k heater - live in southeastern PA outside phila.

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    duraleigh's Avatar
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    Re: Chlorine Levels question

    Everything you are doing is fine. There is nothing wrong with separately adding different types of chlorine to the pool.

    Your FC consumption sounds pretty normal to me.

    You didn't ask, but .5 ppm CC is not enough to warrant shocking the pool. No harm done, though.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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