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Thread: Burn off?

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    Join Date
    May 2011
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    Wichita, KS
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    Burn off?

    I left my cover off all day today and burned off 8ppm of FC. Is this normal for a CYA of 70 with 103 degree weather? Also FC dropped from 8 to 0. If I add enough chlorine to get it back to 8, is it safe to swim, or do I have to shock it? CC was maybe .5 (very slightly pink) clear with one drop of R-0871.

    Also, pool is not 17K, more like 13K gallons. I will fix my sig when I do some better measurements.
    Size: 11370 gallons
    Filter: sta-rite cartridge
    pool: In-ground vinyl
    pump: ?

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    Richard320's Avatar
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    Re: Burn off?

    Sounds high to me, with that much CYA. Might be time for an overnight loss test. pool-school/overnight_fc_test
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Burn off?

    Doing so tonight.
    Size: 11370 gallons
    Filter: sta-rite cartridge
    pool: In-ground vinyl
    pump: ?

  4. Back To Top    #4

    Re: Burn off?

    I have a CYA of 95, I'm keeping it around 11 FC, yesterday was full sun all day long and I lost 5 ppm. When covered I average about 1.5 ppm loss per day.

    Plus I REALLY need to clean it. I'm assuming my biggest problem is that the past week+ it has been covered most of the time and I don't pay as much attention to leaves and dirt collecting in the center, I'll bet once I clean it my loss will be much less.
    Aaron
    [ Vogue Vectra 24' AG | Hard plumb: Hayward Power-Flo Matrix 1HP 2-speed, 27" sand filter & Pentair MiniMax 100 NG | Taylor K-2006 | Central IL ]
    Powered by: TFP, PoolMath & TFTestkits

  5. Back To Top    #5

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    Re: Burn off?

    Different problem now. I am shocking it. But, every time I add large amounts of chlorine, I get a much higher FC then I should per the pool calculator. I am pretty sure of my 11-12K gallon size. I tried to shock up to 28 and ended up at 40+. I waited 1 hour after putting in the chlorine to test. What else could I be doing wrong?
    Size: 11370 gallons
    Filter: sta-rite cartridge
    pool: In-ground vinyl
    pump: ?

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    duraleigh's Avatar
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    Re: Burn off?

    What else could I be doing wrong?
    Almost always a calculation error. Post your math and there are hundreds of sharp-eyed assistants eagerly waiting to help you find it.
    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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    Re: Burn off?

    Which calculations?
    Size: 11370 gallons
    Filter: sta-rite cartridge
    pool: In-ground vinyl
    pump: ?

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    Mod Squad Bama Rambler's Avatar
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    Re: Burn off?

    I think Dave means the pool size calcs.
    Are you using 6% bleach?
    Also, Are you adding gallons or jugs? i.e. when the PC calls for 5 gallons (3.5 jugs) are you adding 5 jugs?

    When I enter 5 jugs instead of 5 gallons in the PC I get that it adds exactly 40 ppm FC.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Burn off?

    I am using 96 ounce jugs of 6% bleach. I am pouring in the number of jugs that it calls for. I do have the jug size set to 96 ounces.

    to go from 4 to 28 FC in my 11370 Gallon pool, it says to add "4 gallons 2 quarts or 5.9 (96 oz) jugs" so I added 6 jugs at 96 ounces each.
    Size: 11370 gallons
    Filter: sta-rite cartridge
    pool: In-ground vinyl
    pump: ?

  10. Back To Top    #10
    Mod Squad Bama Rambler's Avatar
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    Re: Burn off?

    Test the FC then measure and add one gallon of bleach then after 30 minutes test it again. See what one gallon raises it.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  11. Back To Top    #11

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    Re: Burn off?

    Is it mixing well in the pool? If you have double-checked all your numbers and tests, I would say trust your pool. I think the pool calc is intended to get you in the ballpark, and each situation might need to be tweaked a bit. Although, 6 jugs to 4 jugs is quite a big tweak.
    Vinyl In-Ground (vinyl) - about 21600 gallons (18x32 Grecian)
    Hayward DE (model 7220?) filter with Multiport valve
    Challenger Hi Flo Pump (3/4 HP)
    Intex SWG
    leaky/non-functioning Raypak Versa Natural Gas Heater *removed*

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