Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 10 of 10

Thread: FC loss durring hot days

  1. Back To Top    #1

    FC loss durring hot days

    I'm here in AZ (hot 110F), right now my CYA is about 35-40. Last night I put in bleach to the equivalent of 4ppm (I tested the levels). After the pool sits during the day I'm down to .5ppm FC. I have not seen any algae in my test at all. Should I raise my CYA? I feel like Im dumping in lots of bleach daily bi daily...

    11500 gallon pool

    all levels are good right about now.

    Well except my Calcium is high but that another topic...
    Cornerstone 18 x 36 Rectangle 22,000 gallons
    Hayward SS24T High Rate Pro Series Sand Filter
    Inground Vinyl Liner with Polymer Walls
    1.5hp 220 volt energy efficient High Performance Pump
    Intermatic swimming pool Timer TR104P3
    Aqua Genie Skimmer System (2)
    Hayward Color Logic light
    Liner: Oxford aquarius 28 MILL

  2. Back To Top    #2
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: FC loss durring hot days

    You've got it tough down there. Three thoughts:
    1. Cover the pool when you are not using it during the day with an uv opaque cover.
    2. Go to 8 ppm in the evening and check it in the morning to make sure it is above 7 ppm(used poolcalculator.com, 40 ppm CYA to get this value which is the top of the normal range). That should keep you higher, but may not be enough.
    3. Raise your CYA level to 50 ppm, and put your FC at 9 in the evenings and make sure it is at least above 8 ppm in the morning (again calculated using poolcalculator, 50 ppm CYA).

    Keep an eye on your pool...you might want to do a OCLT: http://www.troublefreepool.com/pool-...rnight_fc_test just in case you have organics gobbling up your FC without you knowing it
    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.

  3. Back To Top    #3

    Re: FC loss durring hot days

    ok cool, i just added a jug 182oz ill test b4 bed and in the morning, thanks again tfp!
    Cornerstone 18 x 36 Rectangle 22,000 gallons
    Hayward SS24T High Rate Pro Series Sand Filter
    Inground Vinyl Liner with Polymer Walls
    1.5hp 220 volt energy efficient High Performance Pump
    Intermatic swimming pool Timer TR104P3
    Aqua Genie Skimmer System (2)
    Hayward Color Logic light
    Liner: Oxford aquarius 28 MILL

  4. Back To Top    #4
    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    Location
    East Texas
    Posts
    8,997

    Re: FC loss durring hot days

    I add about 4ppm over my minimum FC# for my CYA level and it seems to work well in Texas. I'm trying to keep right at 50 CYA btw.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

  5. Back To Top    #5
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: FC loss durring hot days

    Quote Originally Posted by the taxidermist
    ok cool, i just added a jug 182oz ill test b4 bed and in the morning, thanks again tfp!
    Let us know the test numbers
    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.

  6. Back To Top    #6

    Re: FC loss durring hot days

    Well before I went to bed I was 8ppm on the nose (pool ran for about 4 hours after adding the bleach), woke up, tested a lil later than I would have liked, 830am... 3.5ppm
    Cornerstone 18 x 36 Rectangle 22,000 gallons
    Hayward SS24T High Rate Pro Series Sand Filter
    Inground Vinyl Liner with Polymer Walls
    1.5hp 220 volt energy efficient High Performance Pump
    Intermatic swimming pool Timer TR104P3
    Aqua Genie Skimmer System (2)
    Hayward Color Logic light
    Liner: Oxford aquarius 28 MILL

  7. Back To Top    #7
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: FC loss durring hot days

    Quote Originally Posted by the taxidermist
    Well before I went to bed I was 8ppm on the nose (pool ran for about 4 hours after adding the bleach), woke up, tested a lil later than I would have liked, 830am... 3.5ppm
    The good news is, you found out why your chlorine is dropping fast. The bad news is, you most likely have organisms (algae, etc.) eating it. It is time for the shocking process: http://www.troublefreepool.com/pool-...king_your_pool, remember it is a process and can take some time.

    Let us know if you have any questions!
    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.

  8. Back To Top    #8

    Re: FC loss durring hot days

    The thing is my CC is .5ppm and water is crystal clear! I can still have algae?
    Cornerstone 18 x 36 Rectangle 22,000 gallons
    Hayward SS24T High Rate Pro Series Sand Filter
    Inground Vinyl Liner with Polymer Walls
    1.5hp 220 volt energy efficient High Performance Pump
    Intermatic swimming pool Timer TR104P3
    Aqua Genie Skimmer System (2)
    Hayward Color Logic light
    Liner: Oxford aquarius 28 MILL

  9. Back To Top    #9

    Join Date
    Aug 2010
    Location
    Boston, MA
    Posts
    176

    Re: FC loss durring hot days

    Yes. If your CCs outgas quickly enough (relative to the rate your FC oxidizes organics and produces them) you can have low CC even with an active bloom. And a low- to moderate-level bloom can frequently not be evident to the naked eye.

    On the bright side, catching a bloom before it becomes visible means that there's less algae and it accordingly takes less bleach to kill it off.
    20k gallon IGP
    Plaster over gunite
    3/4 hp Hayward pump
    Purex Triton DE filter
    TF100 test kit w/ speedstir

  10. Back To Top    #10

    Re: FC loss durring hot days

    awesome, off to buy some bleach!
    Cornerstone 18 x 36 Rectangle 22,000 gallons
    Hayward SS24T High Rate Pro Series Sand Filter
    Inground Vinyl Liner with Polymer Walls
    1.5hp 220 volt energy efficient High Performance Pump
    Intermatic swimming pool Timer TR104P3
    Aqua Genie Skimmer System (2)
    Hayward Color Logic light
    Liner: Oxford aquarius 28 MILL

Posting Permissions

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