Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: determining leak vs evap rate

  1. Back To Top    #1

    Join Date
    Mar 2013
    Location
    NW GA
    Posts
    69

    determining leak vs evap rate

    I think we have a leak.
    Pool service came out two weeks ago and found some pinhole spots in the liner around the skimmer. Now we're supposed to be watching for leaks and report back before he closes out our bill.

    April 30 - May 3 (4 days): day time high of 77, 72x2, 64 and overnight low in mid 50s - no cover on pool - 1/4" lost
    May 4 - May 6 (3 days): 5" of rain
    May 7 - May 12 (6 days): day time high of 70x2, 73x2, 79, 64 and overnight low in low 50s - solar cover on pool - .9" of rain and water level is down 3" from where I wasted on May 6.

    I keep trying to place a bucket on the steps to mark water level inside/outside bucket to see which goes down faster but the current in my pool continues to knock the bucket over even with a brick in the bottom of the bucket. I have the return eyeball pointed away from the steps, b`rs a day - that seems to be the amount needed to keep FC steady.]
    Would the results be affected if I measure water level in a bucket sitting outside the pool and visually compare to water line on side of pool? Seems like an inch of water is an inch of water, right?
    26900 gal IG Vinyl (18'x36', 3' shallow end and 8' deep end plus steps)
    sand filter and 2.7hp variable speed timer
    Jandy Ei SWG (2yr old)

  2. Back To Top    #2
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,488

    Re: determining leak vs evap rate

    1/4" per day or 1" per week is not uncommon for evaporation. The important factors are the water temperature and the dew point temperature so if you put the bucket outside the pool, it won't maintain the same water temperature as the pool. However, with an SWG, you should be able to detect a water leak by the salt level and CYA levels dropping (assuming no splash out or overflow). Have you been experiencing either?
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  3. Back To Top    #3

    Join Date
    Mar 2013
    Location
    NW GA
    Posts
    69

    Re: determining leak vs evap rate

    Yeah... but the past two weekends in a row it rained 4-5" and I had to waste water. So I've wasted 9-10" rainwater in the past two weeks. Wouldn't the rain/wasting also contribute to salt lost?
    I've read to expect an inch per week of evaporation. And 1/4" lost over 4 days seems appropriate. 4" down (3" lower plus nearly an inch of rain) over the past 6 days seems excessive.
    26900 gal IG Vinyl (18'x36', 3' shallow end and 8' deep end plus steps)
    sand filter and 2.7hp variable speed timer
    Jandy Ei SWG (2yr old)

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: determining leak vs evap rate

    4" in six days is excessive. The only way there could not be a leak is if you made a significant error in measuring or somehow pumped out water when you thought you were doing something else.
    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

Posting Permissions

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