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Thread: Crystal Clear Water with little to zero chlorine levels?? Is it safe?

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    Crystal Clear Water with little to zero chlorine levels?? Is it safe?

    I can't seem to get the chlorine levels to register with my test kit. The water is crystal clear with no complaints about irritation. On private well that comes out of the ground at about 7.8ph with very high calcium bicarbonate levels. I add muriatic acid by the gallon. And have added a double amount of CYN over the last while. My biggest question is, is the pool safe with out any detectable chlorine levels. The SWCG (compupool cpsc36) runs 8 hours a day at 90%, from 8 pm to 4 am. Thanks
    20,000g round above ground vinyl. Compupool CPSC36 SWCG. 1.5hp hayward Xtreme cartridge filter and pump.

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    Texas Splash's Avatar
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    Re: Crystal Clear Water with little to zero chlorine levels?? Is it safe?

    Hello and welcome to TFP! Short answer - no. No chlorine means no sanitation protection. But that's odd considering your SWG is running so much. I think the first thing that would help us evaluate your situation is to see a full set of water test results so we can put it all together. Do you have a TF-100 or Taylor K-2006C test kit (link below)?
    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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    Re: Crystal Clear Water with little to zero chlorine levels?? Is it safe?

    Thanks for the reply, current test with a Taylor kit is: Ph 7.4, FC 0, TC 0, CYN 0, CH 300. I don't understand the CYN because I have added enough for double this size of pool. Last test from local leslies store (6-24-16)was Ph 7.2, FC 0, TC 1, CYN 0, CH 330, TA 200, Salt 2750, phosphates 500. Since the leslies test I have added a dose of phosfree, a dose of Cyanuric acid, and not sure how much muriatic acid. The pool is on a farm so it gets some organic matter in it. (bees, leaves, dirt etc.)
    20,000g round above ground vinyl. Compupool CPSC36 SWCG. 1.5hp hayward Xtreme cartridge filter and pump.

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    Texas Splash's Avatar
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    Re: Crystal Clear Water with little to zero chlorine levels?? Is it safe?

    You bring-up a vital point - the organic matter. I wonder if you have something else going on in that water. Here's something you might want to try:
    1. Begin a SLAM and dose FC up to SLAM level. If your CYA test is showing as zero (perhaps converted to ammonia), use a SLAM/Shock FC of 10. Do not add additional CYA at this point.
    2. Retest FC at 10-minute intervals.
    a. If FC loss is greater than 50%, add FC to bring back up to SLAM level and continue retesting FC @ 10-minute intervals.
    b. IF FC loss is 50% or less, add FC to bring back up to SLAM level. Go to Step 3.
    3. If CYA is below 30 ppm, add enough CYA to bring level up to 30 ppm.
    4. Continue SLAM as directed in the SLAM article until the SLAM Criteria of Done are met. Test as directed in the SLAM article - no longer need to test FC at 10 minute increments at this point.
    This may be needed to break-through that wall that's prohibiting you from increasing FC and CYA. Let us know if this does the trick. FYI - Have a good amount of bleach on-hand for those first few applications.
    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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    GreatCanadian's Avatar
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    Re: Crystal Clear Water with little to zero chlorine levels?? Is it safe?

    One quick question. How did you add your CYA? If you added it through the skimmer it could have been lost before it dissolved if you backwashed.

    GC
    13'x22'x52" 8,000 gallon ProSeries Pool with Borates
    Intex 110 pound Sand Filter with Zeobrite, 2650 gph pump, 0.95 hp
    Bestway SWG
    AquaPro ECO500 50,000 BTU heat pump
    GLI Whirlwind Solar Cover Reel, TF-100 Test Kit

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    Re: Crystal Clear Water with little to zero chlorine levels?? Is it safe?

    I wouldn't swim in unsanitized water, personally:

    Naegleria fowleri - Wikipedia, the free encyclopedia
    25,000 Gallons Inground, Gunite
    DE, Hayward Filter
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    Re: Crystal Clear Water with little to zero chlorine levels?? Is it safe?

    I would be concerned when there is no FC. That means that it is being consumed faster than it is being generated and that is not normal.

    If you have no CYA, that is a issue for sure. CYA for a SWG pool is recommended to be 60-80. Pool School - Chlorine / CYA Chart

    Assuming a loss of FC loss of 2ppm per day, your SWG cannot keep up with the demand.

    At 90%
    To recover 1ppm per day, you need to run the SWG 5 hours per day.
    To recover 2ppm per day, you need to run the SWG 10 hours per day.
    To recover 3ppm per day, you need to run the SWG 15 hours per day.
    To recover 4ppm per day, you need to run the SWG 20 hours per day.

    You should probably perform a OCLT to see if you need to SLAM to bring it back to a clean state and then restart with your SWG.
    Pool School - Perform the Overnight FC Loss Test (OCLT)

    Pool School - SLAM - Shock Level And Maintain

    Hope this helps. There is a calculator to determine SWG run time here:
    Formula for SWG / Pump Runtime?
    Matt
    2016 Pool Build: 12k IG Blue Granite Pebblesheen, Travertine Coping & Pavers, Pentair IntelliFlo, Intellichlor, Easytouch, Clean & Clear 320, Heliocol Solar - TF-100 test kit w/ SpeedStir
    SWG Run Time Calculator

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    hoskim's Avatar
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    Re: Crystal Clear Water with little to zero chlorine levels?? Is it safe?

    Blackbart10, I am running into a similar issue (even with SLAM and CYA 80-100). Got some valuable feedback from TFP members and my SWG (T-CELL-9) capacity may be too low (e.g., 2-3 times the pool volume). Consequently, I may consider "switching" to T-CELL-15 (from 9). My posting here - SWG FC Generation Level @100% / Super Chlorinating -
    25,000 Gal, in-ground w/ vinyl liner
    Hayward SP2303VSP (1.5 HP) / DE filter (4820)
    Aqua Rite SWG / T-CELL-9 (v1.5)
    Polaris 380, PB4-60 Booster Pump (post-2012) / Aqua Heat Pump (S95)
    TF-100 Test Kit with Speedstir

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