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Thread: Cause of chlorine loss

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    Join Date
    May 2010
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    Cause of chlorine loss

    OK, the temps have been in the high 80's-low 90's, humid, sunny. Had a higher than normal bather load over the holiday weekend but normal since then (with the possibility a little kid peed in it). Before, I was losing 0 to maybe 1ppm chlorine. Now I am losing about 1-2 during the day (I add more chlorine) and 2ppm overnight. Is it the weather, the possibility a kid peed in the pool over the weekend or what?

    As of this am:
    Cl 3 (I usually target 5-6)
    pH 7.5
    TA 120 (still in the process of bringing it down)
    CYA 40
    Clarity: Clear but not as sparkly as when the weather was cooler
    Pool temp: VERY warm, almost lukewarm

    I am using the HtH 6 way kit this year. (next year I will use the TF100)
    AG Intex Ultra Frame
    Round 16 ft x 48 in, 5061 gal
    2500 gph Intex Krystal Clear Cartridge Filter
    BBB

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    Re: Cause of chlorine loss

    If you think you are losing 2ppm overnight, you need to perform an overnight FC loss test to confirm that.

    If you are losing more than .5ppm at night, you have organics in the pool and need to shock. Directions for the overnight FC loss test and How to Shock your Pool are both up in Pool School.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Cause of chlorine loss

    My advice is to get out in front of this quickly by shocking to completion (less than 1 FC loss overnight; less than .5 CC; AND clear sparkly water). Even if you can't test for CC, you can apparently do the overnight loss test and tell feel (non-slippery/slick vinyl) and look of the water. Then you could target an FC or so higher for a time as insurance. Especially with an Intex, it is important to prevent algae from getting any foothold since clearing it is so difficult with the ltitle filters.
    POOL: Intex ultra new in 2014 (32 x 16 x 52) (seasonal; on concrete pad covered with 1.5" extruded or whatever foam insulation sheets - ugly, but comfy); added a through-wall skimmer; I add salt for feel. EQUIPMENT: Pentair SuperFlo pump (1HP, 2SPD); Pentair cartridge filter (200 sq. ft); Pentair MasterTemp natural gas heater (400,000 btu) Climate/Location: Eastern Nebraska

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    Re: Cause of chlorine loss

    Yeah, I figured I would just go ahead and shock it before I go away and leave it in my husband's hands (scarey). Went to the pool store for the first time just to see what readings I would get compared to mine.

    Everything was the same as my reading except for the CYA. Mine is 40 and they got 60. Makes a difference if I am going to shock. What do you think? They used strips that went into this scanner-like thingy. Go with the higher CYA or the lower?
    AG Intex Ultra Frame
    Round 16 ft x 48 in, 5061 gal
    2500 gph Intex Krystal Clear Cartridge Filter
    BBB

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    Re: Cause of chlorine loss

    Always trust your own results. If you are comfortable with the testing procedure you used and the test itself, go with your number. If not split the difference and go with 50ppm.....that'll work just fine.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad zea3's Avatar
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    Re: Cause of chlorine loss

    Your test is more accurate, but it won't hurt to go with the higher level.
    TFP Moderator
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    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
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    Re: Cause of chlorine loss

    Can high phosphates can fc level to be 0? Unfortunately can not get a fc reading on my taylor k. Have a tc reading. 25,000 fiberglass. All other level are o.k. Was told high levels of phosphates are "eating" up the chol. Seems strange to me. Any opinions?

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    May 2010
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    Re: Cause of chlorine loss

    Thanks Everybody!
    AG Intex Ultra Frame
    Round 16 ft x 48 in, 5061 gal
    2500 gph Intex Krystal Clear Cartridge Filter
    BBB

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    Melt In The Sun's Avatar
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    Re: Cause of chlorine loss

    Robinixie,
    Phosphates don't do that; it's just a line to hopefully sell you some overpriced, unnecessary phosphate remover. If your kit is showing TC but no FC, all your chlorine is present as CC and you should definitely shock that pool!

    If you start your own thread, more people will see it and offer their help.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

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    Re: Cause of chlorine loss

    Thanks melt...it seemed a little far fetched. How will I figure how much shock? In the meantime I will figure out how to start a thread.

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    Re: Cause of chlorine loss

    To start a new thread, go to board index. Then click on the subforum that your question pertains to. Once you do that you'll see a blue box that says "new topic." Click that. Type in your subject and your question.
    POOL: Intex ultra new in 2014 (32 x 16 x 52) (seasonal; on concrete pad covered with 1.5" extruded or whatever foam insulation sheets - ugly, but comfy); added a through-wall skimmer; I add salt for feel. EQUIPMENT: Pentair SuperFlo pump (1HP, 2SPD); Pentair cartridge filter (200 sq. ft); Pentair MasterTemp natural gas heater (400,000 btu) Climate/Location: Eastern Nebraska

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