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Thread: Why did I lose my chlorine?

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    coog61's Avatar
    Join Date
    Nov 2009
    Richmond, TX

    Question Why did I lose my chlorine?

    Two weeks ago my CYA tested at 20. I added stabilizer and waited two weeks to re-test. All other tests over that period were typical with CL = 4-5 and ph = 7.4 to 7.6. Then over 2 days (8 days after adding stabilizer) I lost all the chlorine! Ok, I know I need to SLAM, but what would cause the CL to disappear? SWG lights indicate it's operating. The new CYA is 50.
    17,500 Gallon, SWG 33' x 21' freeform w/ Sunstone Cobalt Plaster. Attached 6 X 6 Spa raised 12" w/ 6 Jets with Moss Rock Spillover. 25' Moss Rock Waterfall. Pentair Intelliflo VS-3050 for Pool, 2 HP Whisperflo for Waterfall, Pentair Clean & Clear Cartridge 320, Pentair 400K BTU Max-E-Therm heater, Pentair Intellichor, Pentair EasyTouch 4P, Pentair Legend Platinum Cleaner w/ 3/4 hp pump, autofill system, nat gas fire pit. BBB convert

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    S1ngram's Avatar
    Join Date
    Jun 2014
    Chrisman, Illinois (East Central Illinois)

    Re: Why did I lose my chlorine?

    From what I understand, you can have algae starting even if your numbers look normal. Have you tested CC? What did that show you?
    27' round Seaspray Evolution, AG, 17,100 gallons, Pump: Hayward Power-Flo Matrix Dual Speed 1.5 hp, Filter: Hayward Pro Series High Rate Sand Filter, June 18, 2014, Kreepy Krauley Lil Shark, TF-100 test kit, Intex Krystal Clear Saltwater System

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    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Columbia, SC

    Re: Why did I lose my chlorine?

    Why do you need to SLAM? Visible algae, cloudy water?

    Just because FC goes to zero you don;t have to do a SLAM unless there is an issue.
    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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