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Thread: Houston Area Daily Chlorine Loss

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    KatyTXPoolOwner's Avatar
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    Houston Area Daily Chlorine Loss

    My FC is dropping significantly during the day. Here's what the last couple of days looked like:

    Friday 9/2 (some swimming, 4 kids for an hour or so)
    8:00 AM FC 4.5 CC 0.0 pH 7.8
    8:15 AM Added 84 oz of 12.5% SH to target FC 8

    Saturday 9/3 (some swimming, 3 kids for an hour or so)
    8:00 AM FC 4.5 CC 0.0 pH 7.8
    8:15 AM Added 84 oz of 12.5% SH to target FC 8
    10:30 AM FC 8.0 CC 0.0 pH 7.8

    Sunday 9/4
    8:20 AM FC 4.0 CC 0.0 pH 7.9
    8:30 AM Added 72 oz of MA to target pH 7.4
    9:00 AM Added 96 oz of 12.5% SH to target FC 8

    I am looking to find out from the Houston TX area TFP'ers what their daily drop is?

    Do your FC drops look similar to mine?

    Do they make sense?

    Thank you!
    23,000 gallon gunite chlorine pool / spa .. French Gray Pebble Sheen .. IntelliFlo VF main pump .. IntelliFlo VS spa booster pump .. WhisperFlo 1HP water feature pump .. LA01N .75HP cleaner booster pump .. Letro Legend Platinum cleaner .. Quad DE 100 filter .. Max-E-Therm 400k heater .. Rainbow 320 chlorinator .. 1.5HP blower .. Easy Touch 8 remote control .. 8 Twirlybyrd jet spa .. Paralevel .. TF-100 w/SpeedStir

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    Isaac-1's Avatar
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    Re: Houston Area Daily Chlorine Loss

    Your FC loss is going to be highly dependant on your CYA level, comparing to nearby pools does not really help much as FC loss will be different from pool to pool depending on a number of factors (sunlight exposure, organic load (either bather or windblown), etc. If you are experiencing excessive FC loss, the first thing you should do is an OCLT Pool School - Perform the Overnight FC Loss Test (OCLT) to see if something is trying to grow. If you pass that then you really need to look at your CYA level and confirm you have good testing technique, the CYA test is one of the hardest to get right, and proper lighting is key (outdoors with full sun to your back, tube held in your shadow at waist level). See the CYA testing videos on youtube.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
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    VinDeeLoo's Avatar
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    Re: Houston Area Daily Chlorine Loss

    Is your pool in full sun. I know Houston is hot and humid. I would not think a loss of 4 is bad. Is your water cloudy? Your CC looks good. What is your cya?


    VinDeeLoo
    7600 gallons ~ AG ~ Summer Waves Cartridge C Filter ~ using pump that came with our Summer Waves 18 x 48 pool ~ Taylor K-2006 (SpeedStir & Sample Sizer) ~ no well water or water restrictions

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    KatyTXPoolOwner's Avatar
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    Re: Houston Area Daily Chlorine Loss

    VinDeeLoo - Yes, pool is in full sun pretty much all day ( ~ 8:30am - ~ 6:00pm )

    Isaac1 - I haven't done an OCLT test in a while. Aside from this FC drop issue I really haven't seen a need to do one. How often is an OCLT suggested? I was looking for input from other area pool owners due to a similarity in weather.

    Other chemistry:
    CH 350
    TA 70 (although today's MA will probably drop it to ~60)
    CYA 50
    BOR 40 (relying on pool store borates test, have not yet purchase own borates test)

    Pool is clear and no other issues that I'm aware of.

    Thank you!
    23,000 gallon gunite chlorine pool / spa .. French Gray Pebble Sheen .. IntelliFlo VF main pump .. IntelliFlo VS spa booster pump .. WhisperFlo 1HP water feature pump .. LA01N .75HP cleaner booster pump .. Letro Legend Platinum cleaner .. Quad DE 100 filter .. Max-E-Therm 400k heater .. Rainbow 320 chlorinator .. 1.5HP blower .. Easy Touch 8 remote control .. 8 Twirlybyrd jet spa .. Paralevel .. TF-100 w/SpeedStir

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    VinDeeLoo's Avatar
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    Re: Houston Area Daily Chlorine Loss

    I would run an OCLT, but I also think if you pass you are ok.


    VinDeeLoo
    7600 gallons ~ AG ~ Summer Waves Cartridge C Filter ~ using pump that came with our Summer Waves 18 x 48 pool ~ Taylor K-2006 (SpeedStir & Sample Sizer) ~ no well water or water restrictions

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    Re: Houston Area Daily Chlorine Loss

    KatyTX, don't have my notebook with me but I know I add 2 ppm each day and my FC levels have been pretty stable or even creeping up over time. My CYA is ~50, and my pool gets sun from late morning through sunset. If you are confident your chlorine is actually 12.5% (seems like your Saturday test confirmed it was ok?) I support the OCLT recommendation, hopefully gives you peace of mind you don't have to SLAM again.....!
    Graeme // 15k gal 29x15 geometric IG w/750 gal spa, Wet Edge Northshore Tahoe, travertine coping and decking, Clean & Clear Plus 420 sq ft cartridge filter, Intelliflo VS pump, 1hp water feature pump, Easytouch 8 w/wireless handheld, Racer pool cleaner, 400,000 BTU Max-E-Therm heater, Stenner 45MPHP10 w/15 gal tank, Intellibrite 5G LED lighting, bubblers, pencil jets, TF-100 w/SpeedStir, Borates & Salt. Finished and filled June 2015!

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    Isaac-1's Avatar
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    Re: Houston Area Daily Chlorine Loss

    Sorry I thought I replied to this already, maybe my post did not go through, Anyway I said you should do an OCLT any time you have unexplained chlorine consumption.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

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    KatyTXPoolOwner's Avatar
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    Re: Houston Area Daily Chlorine Loss

    Thank you for all the feedback. I'll do an OCLT and go from there (hopefully with the status quo).


    23,000 gallon gunite chlorine pool / spa .. French Gray Pebble Sheen .. IntelliFlo VF main pump .. IntelliFlo VS spa booster pump .. WhisperFlo 1HP water feature pump .. LA01N .75HP cleaner booster pump .. Letro Legend Platinum cleaner .. Quad DE 100 filter .. Max-E-Therm 400k heater .. Rainbow 320 chlorinator .. 1.5HP blower .. Easy Touch 8 remote control .. 8 Twirlybyrd jet spa .. Paralevel .. TF-100 w/SpeedStir

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    Ronald U.'s Avatar
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    Re: Houston Area Daily Chlorine Loss

    Hello. I'm in Houston area and have daily FC loss around 2.5.
    In-ground gunnite, 24k gal., Hayward DE filter, bleach, borate, Hayward Tiger Shark robotic cleaner, 75% full sun

  10. Back To Top    #10
    PoolingAround's Avatar
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    Re: Houston Area Daily Chlorine Loss

    I lose about around 4 FC in the day as well and I'm in Katy. CYA was 40 (before salt) and no algea (passed OCLT) so it just seems like par for the course for a pool in full sun.
    18k gallon, 20x32, salt IC20, gunite with quartz finish, raised spa with overflow, flagstone coping, moss rock waterfall, Pentair Intelliflo variable speed pump, Pentair Racer, Pentair pool pump, cartridge filter, heater, etc., acid dispenser.
    TF-100 kit for sparkling clean water.

  11. Back To Top    #11
    KatyTXPoolOwner's Avatar
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    Re: Houston Area Daily Chlorine Loss

    Did an OCLT and lost nothing (FC 7.5 at 9:55pm last night and same thing this morning at 6:10). Yeah! No more SLAMmies! If you're old enough you'll get the game show reference.
    Sounds like people in my area and similar situations also experience a drop of 3-4 FC on a daily basis, especially if it's a sunny day. Thank you for the feedback! Think I might celebrate no more SLAMmies on National Beer Lovers Day with a beer by the pool.


    23,000 gallon gunite chlorine pool / spa .. French Gray Pebble Sheen .. IntelliFlo VF main pump .. IntelliFlo VS spa booster pump .. WhisperFlo 1HP water feature pump .. LA01N .75HP cleaner booster pump .. Letro Legend Platinum cleaner .. Quad DE 100 filter .. Max-E-Therm 400k heater .. Rainbow 320 chlorinator .. 1.5HP blower .. Easy Touch 8 remote control .. 8 Twirlybyrd jet spa .. Paralevel .. TF-100 w/SpeedStir

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    VinDeeLoo's Avatar
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    Re: Houston Area Daily Chlorine Loss

    Quote Originally Posted by KatyTXPoolOwner View Post
    No more SLAMmies! If you're old enough you'll get the game show reference.
    I remember that show!


    VinDeeLoo
    7600 gallons ~ AG ~ Summer Waves Cartridge C Filter ~ using pump that came with our Summer Waves 18 x 48 pool ~ Taylor K-2006 (SpeedStir & Sample Sizer) ~ no well water or water restrictions

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