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Thread: What am I doing wrong ....FC dropping

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    What am I doing wrong ....FC dropping

    I have been going through the shock process all week because I have been using so much chlorine. I'm now on day 4 and I lost 4ppm last night. I started the night with FC of 23 and now I'm 18. My CC has never been anything but 0 and my pool has been crystal clear ever since I started the BBB method in the beginning of the spring. I'm was using about 1 gallon of 12% bleach from SAMs a day so I decided to do the shock process because I thought I was using to much bleach. My CYA is between 40-50 but my pool is in direct sunlight with a water temp of about 90, should I have a higher cya?

    Also my ph has always been perfect between 7.4-7.6. I just use lots of chlorine.
    16x32 liner pool, system 3 modular cartridge filter. K-2006 test kit

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    Butterfly's Avatar
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    Re: What am I doing wrong ....FC dropping

    I started the night with FC of 23 and now I'm 18
    Was this an OCLT? Tested after no sun on pool last night and before sun hit pool this morn?

    What is your location, city/state?
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    Re: What am I doing wrong ....FC dropping

    I'm sorry what is OCLT?

    The fc was 23 right before it got dark and 18 this morning at 7. It's a cloudy day so no sunlight.

    I live in southeast LA near new Orleans
    16x32 liner pool, system 3 modular cartridge filter. K-2006 test kit

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    Mod Squad jblizzle's Avatar
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    Re: What am I doing wrong ....FC dropping

    Overnight Chlorine Loss Test, see article in Pool School. You actually almost did it correctly.

    You need to continue to maintain the shock level FC until you pass the 3 criteria to stop ... one of which is the OCLT.
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    Richard320's Avatar
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    Re: What am I doing wrong ....FC dropping

    Nothing. You're doing things right.

    I know it would be more satisfying if your pool had started green and had some kind of visual improvement to show you're making progress, but it is what it is. There are several others in the same boat as you posting here right now.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: What am I doing wrong ....FC dropping

    Your Sam's sells 12.5% chlorine? I wish mine did. All mine has is the 8.25% Clorox. How much are you paying?
    23x40 freeform w/spa, 28,000 gal. PCC-2000 in-floor cleaning. Pebble Sheen w/flagstone coping. 14' weeping wall, (2) 18" sheer descents. Sta Rite- cart 400 sqft. filter, Intellipro VS pump, 1hp (cleaning)2hp (water feature)Max E Pro's. Easy Touch 8 function w/IPod. Rainbow chlorinator, Paramount Clear O3 (I know, I know), Max-E-Therm 400K heater.

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    Re: What am I doing wrong ....FC dropping

    I think it's almost 9 for 3 gallons of bleach. At this rate I may need to go buy a pallet.


    I will keep at it, I was just beginning to wonder if that's a myth that you drop less than 1 ppm a night.
    16x32 liner pool, system 3 modular cartridge filter. K-2006 test kit

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    Re: What am I doing wrong ....FC dropping

    That sounds like the regular concentrated Clorox. It's 8.25% and not a full gallon at 121oz. Check the bottles and adjust your numbers on the pool calculator.

    1ppm or less chlorine loss at night is the goal. If it's more then you need to shock. You will get there soon if you follow these guidelines.
    23x40 freeform w/spa, 28,000 gal. PCC-2000 in-floor cleaning. Pebble Sheen w/flagstone coping. 14' weeping wall, (2) 18" sheer descents. Sta Rite- cart 400 sqft. filter, Intellipro VS pump, 1hp (cleaning)2hp (water feature)Max E Pro's. Easy Touch 8 function w/IPod. Rainbow chlorinator, Paramount Clear O3 (I know, I know), Max-E-Therm 400K heater.

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    Re: What am I doing wrong ....FC dropping

    Well dang it .... That's my problem. I could have sworn the bleach was 12%. Now I know what I'm doing wrong!!!
    16x32 liner pool, system 3 modular cartridge filter. K-2006 test kit

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