Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: How to account for this?

  1. Back To Top    #1

    Join Date
    May 2007
    Location
    Fayetteville, Arkansas
    Posts
    220

    How to account for this?

    Normal readings . . . CYA of 50 . . . FC holding overnight . . . losing appx. 4ppm FC during the day? What's considered 'normal' loss in a direct sun situation? Requires appx 3 - 96 ouncers a day to bring back to target.
    20x40 30,000 gal IG Liner, Pentair II Sand

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887
    How normal your loss is depends on what FC level you are starting at. With CYA at 50 you can expect to lose about 50% of your FC level each sunny day, a little more if the pool gets direct sunlight the entire day.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Join Date
    May 2007
    Location
    Fayetteville, Arkansas
    Posts
    220
    My target is 5.7 with CYA at 50.
    20x40 30,000 gal IG Liner, Pentair II Sand

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887
    Losing 4 ppm from a starting point of 5.7 is not normal and suggests that something is growing in the water. It sounds like it is time to shock the pool.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  5. Back To Top    #5

    Join Date
    May 2007
    Location
    Fayetteville, Arkansas
    Posts
    220
    Even if FC is holding overnight?
    20x40 30,000 gal IG Liner, Pentair II Sand

  6. Back To Top    #6

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,085
    Holding overnight is strange when there is such a large loss during the day, but suggests that whatever is using up the chlorine may be growing during the day. So this could be a nascent algae bloom. As Jason stated, try shocking the pool and then see how things go after that. Perhaps you've got a hole in the ozone layer directly above your pool
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  7. Back To Top    #7

    Join Date
    May 2007
    Location
    Fayetteville, Arkansas
    Posts
    220
    Thanks guys . . . Aldi's Here I Come . . . woo hooo 99 cents a jug
    20x40 30,000 gal IG Liner, Pentair II Sand

Posting Permissions

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