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Thread: New to BBB / Need to understand Chlorine loss

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    Dennis T's Avatar
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    New to BBB / Need to understand Chlorine loss

    Last Night's readings were

    FC 4
    CC 1.5
    PH 7.45
    TA 160
    CH 180

    I added 73 oz of bleach to get FC level to 5

    Tonight's Readings

    FC 1
    CC .5
    PH 7.4
    TA 170
    CH 180
    CYA 50

    It was sunny and mid 90's today. Here in Columbia we have full sun most days. Is this level of FC loss in a 24 hour period normal for the climate we live in? Thanks, Dennis
    30k gallon Gunite/Sand filter/ Pentair 2hp pump

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    Smykowski's Avatar
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    Re: New to BBB / Need to understand Chlorine loss

    I would say that 4ppm in 24 hours isn't outside the realm of possibility. However, I'd question that CC reading from yesterday. Anything above .5 is indicative of a problem. How has the CC been over the last few days?
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
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    Mod Squad jblizzle's Avatar
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    Re: New to BBB / Need to understand Chlorine loss

    The "norm" (if there is such a thing) seems to be 2-4ppm per day.

    Looks like you may be a little on the high side. Doing an OCLT can confirm if there is anything living in the pool making your use higher.

    EDIT: Oh yeah, did not see the CC ... definitely do the OCLT
    Jason, TFP Moderator
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    Dennis T's Avatar
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    Re: New to BBB / Need to understand Chlorine loss

    Thanks fo rthe reply

    6/18 - FC .6 / CC .8 added 247 oz bleach

    6/20 - FC 4 / CC 1.5 added 73 oz bleach

    6/22 - FC 1 / CC .5 Wondering what to do

    I'm sorry but I do not know what OCLT is. Thanks, Dennis
    30k gallon Gunite/Sand filter/ Pentair 2hp pump

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    Dennis T's Avatar
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    Re: New to BBB / Need to understand Chlorine loss

    Found it. Will perform test in the AM and post results. Dennis
    30k gallon Gunite/Sand filter/ Pentair 2hp pump

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    Mod Squad jblizzle's Avatar
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    Re: New to BBB / Need to understand Chlorine loss

    you have to test after dark at night and then before the sun comes up in the morning to do the test accurately.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Dennis T's Avatar
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    Re: New to BBB / Need to understand Chlorine loss

    Thanks for answering on the run.

    FC .6 this morning. Overnight loss of .4

    Need to get to shock level?
    30k gallon Gunite/Sand filter/ Pentair 2hp pump

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    Smykowski's Avatar
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    Re: New to BBB / Need to understand Chlorine loss

    I'd shock it, but not because of the overnight loss. The loss was less than 1, and I think that's even within the error of the test. I'd shock it because you're letting your FC get too low. With a CYA of 50, you should never let it get below 4, and preferably be between 6 and 8.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
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    Mod Squad jblizzle's Avatar
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    Re: New to BBB / Need to understand Chlorine loss

    You are letting the FC get way too low. You should be adding daily to stay above a FC of 4ppm at all times.

    I would raise the FC up to shock level once and let it drift down. Then redo the OCLT tonight to see if you need to continue the shock process.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    Jason, TFP Moderator
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    Dennis T's Avatar
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    Re: New to BBB / Need to understand Chlorine loss

    I had FC at 4, just starting BBB, after the 4 reading I addede 73 oz to get it to 5 that evening the next evening (yesterday) the reading was 1
    30k gallon Gunite/Sand filter/ Pentair 2hp pump

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    Mod Squad jblizzle's Avatar
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    Re: New to BBB / Need to understand Chlorine loss

    bottom line is that 4 is a minimum and if you are losing 4 ppm per day then you need to be dosing up to 8.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Dennis T's Avatar
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    Re: New to BBB / Need to understand Chlorine loss

    Will do. Thanks J
    30k gallon Gunite/Sand filter/ Pentair 2hp pump

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