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Thread: Chlorine usage increase

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    Join Date
    Mar 2014
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    Chlorine usage increase

    Hi all! Just curious about chlorine usage. Im still new and been doing chemicals since January. When I started I had to add almost no chlorine and I expected it to increase with Texas sun. I'm currently aiming at 4.0 ppm and I added 1 gallon 3 days ago and today I tested .5 ppm. Water temp is about 77 degrees, outside temps have been hitting upper 80's with plenty of sun. Pool isn't exposed to a lot of sun, but some late am and early afternoon about 5-6 hours. Normal? Pool is approx 25k gallons.
    23,000k IG pool/spa (water spillover spa), Pentair 1 1/2 horse pump, Pentair 48 sq ft D.E. filter, Raypak 406k btu heater, manual vac (dolphin robotic cleaner coming soon).

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    Texas Splash's Avatar
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    Re: Chlorine usage increase

    You're doing well to show any FC at this point, but it's very low right now. Most of us lose about 2-4 ppm per day when our pool is chugging-along well & healthy. Not sure what your CYA is, but refer to the Chlorine/CYA Chart (link below) and make sure to maintain that FC target based on you current CYA before algae tries to settle in. It won't take long now that our temps are creeping up. Hope that helps.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    Mod Squad tim5055's Avatar
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    Re: Chlorine usage increase

    Remember, a pool needs to be fed its diet of chlorine daily, not every few days. That is why so many of us have automated chlorine delivery with things like salt water chlorine generators, Stenner pumps and liquidators.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Chlorine usage increase

    CYA has been steady at 40. I haven't tested in a few weeks though since temps have risen. Possibly aim for a higher target FC level?

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    Texas Splash's Avatar
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    Re: Chlorine usage increase

    A CYA of 40 requires a target FC of 5, never lower than 3. If you ever see algae (green or cloudiness) you will need to SLAM (link below) which would require an FC level of 16 until the SLAM is completed. So you can see that it's very important to keep that FC at the daily target range. Definitely check FC daily, and quite possible pH if you haven't done that lately. A lot of this is emphasized in the Pool School section (link below). Hope that helps.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Re: Chlorine usage increase

    Thanks for your response - will do! PH generally creeps up during the week and I've been adding about 32oz per week to keep it at 7.4

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    Texas Splash's Avatar
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    Re: Chlorine usage increase

    When you get a chance, along with the "light reading" we've suggested, make sure to add your pool info to the bottom of your signature. You can do this by going to the top of the TFP web page (just under the Pool School button) and select "SETTINGS". On the next page look to the left for a menu bar that says, “MY SETTINGS” and go to "EDIT SIGNATURE" to enter your pool and equipment info there. It will help us later. This link may also help you: Pool School - Read This BEFORE You Post.

    Have a nice evening.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Mod Squad woodyp's Avatar
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    Re: Chlorine usage increase

    I'd get that CYA level to 50 or 60. Mine is at 60. Raise your FC target level accordingly.
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