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Thread: No overnight loss of FC

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    Join Date
    Mar 2016
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    Friendswood Texas
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    No overnight loss of FC

    Last Sunday night I had CC of 1.5 for the first time. It has never been more than .5 . So I brought my FC up to SLAM level of 20 since my CYA is around 45. I checked the FC and CC Tuesday and I was @ 16 FC and 0 CC . Then last night I had 14FC .5 CC . I checked this morning and FC was still 14 and had .5 CC . So I had no FC loss overnight, why do I still have some CC ? No one has been in it since sunday, shouldnt my FC get rid of any CC ?
    Friendswood TX, 23x39 free form , 20K gallons , 3 HP VS pentair , 1 HP whiisperflo, Pentair easy touch , 400k BTU pentaier heater, Deck Jets, Pentair 5g LED Lights. Tanning ledge with bubblers. Taylor 2006 test kit

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    May 2016
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    Lynchburg, VA
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    Re: No overnight loss of FC

    Not necessarily. CC itself is not a contaminate in your pool. It's a byproduct of your FC working on sanitizing your pool. It just means your FC is doing it's job, and there's still something in the water it's having to work extra hard on. You have enough of a contaminate in your pool for CC to register on your test, but not enough that your pool lost any more FC overnight.

    You passed the first two tests indicating your SLAM is complete (FC at or below 0.5 and OCLT test passed). If your water looks clear, then your SLAM is complete and you can let your FC levels drop back down to normal.

    Kudos to you for a successful SLAM!
    12250 gallons | IG | Vinyl liner | Sand Filter | Emerson 1081 Pump EUST1102 | Hayward Pro Series High Rate Sand Filter Model #S166T | Pool <10 yrs. old | Taylor K-2006 test kit | SharkVac automatic pool cleaner

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    Re: No overnight loss of FC

    The water was always crystal clear. Thats why I was a little freaked out when I had 1.5 CC show up during testing last weekend. Of course we are having a big holiday blow out this weekend and I am having to SLAM the pool. I guess its good I caught it in time to get the pool in order before we have 30 people over with a pool that is not safe to swim in. If my FC is still a little high, 9-10 on saturday, that shouldnt be too bad on peoples eyes should it?
    Friendswood TX, 23x39 free form , 20K gallons , 3 HP VS pentair , 1 HP whiisperflo, Pentair easy touch , 400k BTU pentaier heater, Deck Jets, Pentair 5g LED Lights. Tanning ledge with bubblers. Taylor 2006 test kit

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    JoyfulNoise's Avatar
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    May 2015
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    Re: No overnight loss of FC

    Having an elevated CC level for a short period of time is not typically an indication of a problem. You probably did not need to SLAM your pool. Elevating the chlorine up above your target and holding it there probably would have resolved the CCs.

    CCs can get generated for a lot of different reasons. Transient high CCs is not typically a problem.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: No overnight loss of FC

    So next time I see a 1-1.5 CC and the pool is clear , should I wait a day to see if it increases or stays the same before I raise the FC level ?
    Friendswood TX, 23x39 free form , 20K gallons , 3 HP VS pentair , 1 HP whiisperflo, Pentair easy touch , 400k BTU pentaier heater, Deck Jets, Pentair 5g LED Lights. Tanning ledge with bubblers. Taylor 2006 test kit

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    JoyfulNoise's Avatar
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    Re: No overnight loss of FC

    Quote Originally Posted by jeffnsheila View Post
    So next time I see a 1-1.5 CC and the pool is clear , should I wait a day to see if it increases or stays the same before I raise the FC level ?
    Yeah, I wouldn't jump to a SLAM right away. Even if the pool had elevated CCs like that for a day, there's really no harm. If it comes back down, no worries then. You could even add a little extra FC that day to see if it helps.

    I've had weeks of 0 CCs and then, every so often, it'll pop up to 0.6-0.8ppm, then go back down to zero the next day. Nothing to worry about in my opinion.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: No overnight loss of FC

    Thank you all for your help. Being a first time pool owner and the only guy in my neighborhood using the TFP method, it is really nice to get valuable info quickly on this site.
    Friendswood TX, 23x39 free form , 20K gallons , 3 HP VS pentair , 1 HP whiisperflo, Pentair easy touch , 400k BTU pentaier heater, Deck Jets, Pentair 5g LED Lights. Tanning ledge with bubblers. Taylor 2006 test kit

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    JoyfulNoise's Avatar
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    Re: No overnight loss of FC

    Quote Originally Posted by jeffnsheila View Post
    Thank you all for your help. Being a first time pool owner and the only guy in my neighborhood using the TFP method, it is really nice to get valuable info quickly on this site.
    Then you must have the nicest pool on the block

    Glad we can help.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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