Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 12 of 12

Thread: Is there an overnight FC change chart with checklist?

  1. Back To Top    #1

    Is there an overnight FC change chart with checklist?

    Pool school has a FC test of no more than .5 FC change in 24 hours.

    I've been looking for a normal FC checklist and not finding it.

    I expect to find something like this

    Overnight FC change, evaluation, checklist of observations needed

    0-.5 excellent, no action need

    5+, danger, check for
    [ ] visible aglae
    [ ] debris
    [ ] ph, cya, alka levels
    [ ] filtration flow, need cleaning?
    [ ] increased swim load without adjustment of treatment chemicals
    [ ] ncomplete shock treatment
    etc...

    And then the inbetween

    1.0 to ##.##, very good, but watch out for.....

    ###.## to ###.## good, but these actions should be taken

    ## to ####, border line, increase Chlorine for one day and if no improvement, then take these steps...
    36K gal, gunite w/ plaster,[18W x 38L x 8 deep end] 300SF cartridge, 80-100 GPM filter, Sta-rite S7M120 and Polaris 9300 electric robot. Rooftop 6 panel Solar heater, Sacramento Valley, Climate Zone 8

  2. Back To Top    #2
    Charlie_R's Avatar
    Join Date
    May 2013
    Location
    Mexico, MO
    Posts
    2,156

    Re: Is there an overnight FC change chart with checklist?

    How much of Pool School have you read?

    The only "chart" you really need is the CYA/FC chart.

    Since every pool is unique, what works for your pool wouldn't necessarily work for someone else, say in AZ or TX.

    The Overnight Chlorine Loss Test is:

    1) no more than 1 ppm FC loss overnight (sundown to within 2 hours of sunup).

    2) no more than .5 ppm CC

    3) clear water (you could read the lettering on a quarter on the bottom of the deep end).

    Do you have a good test kit? If not, Please follow the links in Pool School and get one. This is a purchase you will be glad you did, and your pool will thank you.
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Is there an overnight FC change chart with checklist?

    Sorry, no flow charts here. We've discussed it, but there are too many variables.

    Realistically, you'll get to know the pool's personality after a couple weeks of testing and logging the results. You'll see increased chlorine demand long before you'll see a spike in CC or cloudy water if you're religious about testing. And then when something does look amiss, you'll be able to go back and think what has changed; pool party? toddler in swim diaper? Windstorm blew crud in the pool? Heat wave?

    If CC is climbing, FC is dropping, and the solution is usually the same

    [center:suukr13t][/center:suukr13t]
    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!

  4. Back To Top    #4

    Re: Is there an overnight FC change chart with checklist?

    ok, just thought I would ask. strange results: FC up .5 one day and down 3.0 next, and don't think its the drops, unless the 10ml sample is more likely to show bigger swings in the numbers. my FC jumps so I thought the lower volume test would be enough. weird was PH dropping from 7.4 to 7.0, or less. added a touch of CL today, and some city water, if same results will add some alka up, but had to work today so no time for learning new chem treatments
    36K gal, gunite w/ plaster,[18W x 38L x 8 deep end] 300SF cartridge, 80-100 GPM filter, Sta-rite S7M120 and Polaris 9300 electric robot. Rooftop 6 panel Solar heater, Sacramento Valley, Climate Zone 8

  5. Back To Top    #5
    Butterfly's Avatar
    Join Date
    May 2007
    Location
    South Carolina
    Posts
    10,045

    Re: Is there an overnight FC change chart with checklist?

    Quote Originally Posted by Notri4MeBikeSwim
    ok, just thought I would ask. strange results: FC up .5 one day and down 3.0 next, and don't think its the drops, unless the 10ml sample is more likely to show bigger swings in the numbers. my FC jumps so I thought the lower volume test would be enough. weird was PH dropping from 7.4 to 7.0, or less. added a touch of CL today, and some city water, if same results will add some alka up, but had to work today so no time for learning new chem treatments
    What are you using to chlorinate your pool? Trichlor/Dichlor are acidic and will lower pH.

    Have you added any acid?

    "Alka up" is baking soda. We use it to raise TA. For raising pH, we use Borax.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  6. Back To Top    #6

    Re: Is there an overnight FC change chart with checklist?

    Interesting, maybe that's the problem. I've been using kemtek chlorate 2 from home depot/lowes. 90% other ingredients. 2 gal changed ph from 7.0 to 8.0. i thought it was just 12% bleach, but now thinking something else is in it that is messing up the water treatment
    36K gal, gunite w/ plaster,[18W x 38L x 8 deep end] 300SF cartridge, 80-100 GPM filter, Sta-rite S7M120 and Polaris 9300 electric robot. Rooftop 6 panel Solar heater, Sacramento Valley, Climate Zone 8

  7. Back To Top    #7

    Re: Is there an overnight FC change chart with checklist?

    SECTION II - HAZARDOUS INGREDIENTS
    SODIUM HYPOCHLORITE ( 7681-52-9:UN1791)......... 10%
    SODIUM HYDROXIDE (1310-73-2;UN1823)............ 0.8%

    SECTION III - PHYSICAL DATA
    pH ............................ 12
    36K gal, gunite w/ plaster,[18W x 38L x 8 deep end] 300SF cartridge, 80-100 GPM filter, Sta-rite S7M120 and Polaris 9300 electric robot. Rooftop 6 panel Solar heater, Sacramento Valley, Climate Zone 8

  8. Back To Top    #8
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: Is there an overnight FC change chart with checklist?

    That is fine liquid chlorine. It is not the source of your ph drop.

    What is your TA?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

  9. Back To Top    #9

    Re: Is there an overnight FC change chart with checklist?

    Last time I checked it was 100. I'll check again tomorrow and let you know
    36K gal, gunite w/ plaster,[18W x 38L x 8 deep end] 300SF cartridge, 80-100 GPM filter, Sta-rite S7M120 and Polaris 9300 electric robot. Rooftop 6 panel Solar heater, Sacramento Valley, Climate Zone 8

  10. Back To Top    #10

    Re: Is there an overnight FC change chart with checklist?

    Yesterday
    PH 8.0
    FC 8.5

    Today
    FC 6.0
    CC 0
    TA 120
    CH 625
    PH 8.0

    CYA -- don't know, either 35 or 50. 30 to 35 if when the black dot disappears, 50 if when the dot starts getting fuzzy.
    Beginning to suspect CYA is too low
    36K gal, gunite w/ plaster,[18W x 38L x 8 deep end] 300SF cartridge, 80-100 GPM filter, Sta-rite S7M120 and Polaris 9300 electric robot. Rooftop 6 panel Solar heater, Sacramento Valley, Climate Zone 8

  11. Back To Top    #11
    Charlie_R's Avatar
    Join Date
    May 2013
    Location
    Mexico, MO
    Posts
    2,156

    Re: Is there an overnight FC change chart with checklist?

    30 - 35 when the dot disappears. That would be close to your level. Fine there. Expect some loss of FC during the day, even on cloudy days.
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

  12. Back To Top    #12
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: Is there an overnight FC change chart with checklist?

    Don't let you ph get above 7.8. I would lower it down to 7.2 whenever you get to 7.6 this will also lower your TA which may help with your ph rise. With the high calcium you have, you are at risk for scaling if you continue to let your ph get so high.

    Is you plaster new?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •