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Thread: Added bleach to raise FC to 6 but went to 8.5

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    Join Date
    Jun 2013
    Location
    Louisville, KY
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    Question Added bleach to raise FC to 6 but went to 8.5

    This will be my 3rd year using the TFP method with the same pool. For whatever reason, when I added bleach last night to the pool it took the FC level up higher than I anticipated. My pool is aprox. 9,300 gallons (21 ft round by 3.58 inches deep).
    I used the pool calculator to figure raising my FC from 1.5 to 6 (between the rain and me being sick I wanted it a little higher than my target). I added 64 oz of 8.25% bleach and when I retested a couple hours later the FC was at 8.5 (17 drops). I would have had to add about 98 ounces of bleach to get that. I tested again this morning before sunrise and FC was at an 8 (16 drops). Any ideas? I'm so stumped.


    readings from last night

    CC .5
    FC 8.5
    PH 7.3
    TA 60
    CYA - 0- socks are currently in pool, just opened this past Sunday
    21ft round Doughboy AG, 9,300 gallons
    22 inch ClearWater Sand Filter
    1 HP Hayward Power Flo Matrix Pump
    Install 6/16/13
    TF-100 Test Kit

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    mrcarcrazy's Avatar
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    Jan 2014
    Location
    Odessa, TX
    Posts
    973

    Re: Added bleach to raise FC to 6 but went to 8.5

    My theory is that your water wasn't fully mixed (you said rain?) when you tested initially. SO your FC was higher than you thought....
    IG gunite/plaster pool/spa Started 1/17/14, Plastered 5/16/14
    Size: 12'-21'x39' free form, depth ranging from 4' to 7, attached 6 person spa with spillover.
    Equipment: Whisperflo 2hp pump, Pentair 30" sand filter, Pentair Mastertemp 400k BTU heater, 1hp Whisperflo for waterfalls, and a blower for spa floor

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    Jun 2013
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    Louisville, KY
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    Re: Added bleach to raise FC to 6 but went to 8.5

    I targeted a liitle higher due to upcomming rain, (didn't want to have to add bleach in the rain). It hadn't rained enough prior to mess with the testing. My pump has been running 24/7 right now as well.
    21ft round Doughboy AG, 9,300 gallons
    22 inch ClearWater Sand Filter
    1 HP Hayward Power Flo Matrix Pump
    Install 6/16/13
    TF-100 Test Kit

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    Patrick_B's Avatar
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    Jun 2011
    Location
    Midland TX
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    Re: Added bleach to raise FC to 6 but went to 8.5

    Is the pool a little low on fill level?
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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    Join Date
    Jun 2013
    Location
    Louisville, KY
    Posts
    64

    Re: Added bleach to raise FC to 6 but went to 8.5

    No not at all. I'm going to really study my next couple weeks testing results after adding my bleach. I tested a few minutes ago and I lost 2.5ppm of bleach since last night so I should be good to wait until tomorrow to add again.
    21ft round Doughboy AG, 9,300 gallons
    22 inch ClearWater Sand Filter
    1 HP Hayward Power Flo Matrix Pump
    Install 6/16/13
    TF-100 Test Kit

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    duraleigh's Avatar
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    Sebring, Florida
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    30,084

    Re: Added bleach to raise FC to 6 but went to 8.5

    I like mrcarcrazy's thought......your pump was running during all tests, correct? You took the sample about a foot or deeper into the pool, correct?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  7. Back To Top    #7

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    Louisville, KY
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    Re: Added bleach to raise FC to 6 but went to 8.5

    Yes, my pump has been running non stop since Sunday when we opened. I took the test water from the opposite side of the return about a foot down. I will be adding bleach this evening. I'm going to add it in 2 steps tonight. I'll test after each addition and see what I come up with. I will make sure I wait about 45 minutes after each addition before I test.
    21ft round Doughboy AG, 9,300 gallons
    22 inch ClearWater Sand Filter
    1 HP Hayward Power Flo Matrix Pump
    Install 6/16/13
    TF-100 Test Kit

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    Patrick_B's Avatar
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    Jun 2011
    Location
    Midland TX
    Posts
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    Re: Added bleach to raise FC to 6 but went to 8.5

    Well, no worries. Something was off a little, but no biggie going to 8.5.

    Double check everything on your next round of testing and addition, and see how it goes.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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