Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 5 of 5

Thread: Cant keep chlorine in pool!

  1. Back To Top    #1

    In the Industry

    Join Date
    May 2013

    Cant keep chlorine in pool!

    Hi, my name is Ryan and I own and operate a pool cleaning and repair company in Lake County FL. I have aquired 4 new pools that have me totally baffled. I have the water test results for all 3 pools and they are as follows: (note - all test were done 1 week after last service)

    POOL 1: 35,000 gallon pool, diamond bright
    FC - .5
    TC - .5
    PH - 7.6
    ALK - 90
    CH - 230
    CYA - 50
    PHOSPHATE - 50
    NITRATE - 0
    AMMONIA - 0

    The week prior there was 7.5 gallons of liquid chlorine put into the pool along with 2 3" chlorine tabs. This pool keeps a constant PH balance of 7.6. I haven't seen it drop below that or raise any higher than that. There is no algae growth but pool is cloudy every week when I return.

    POOL 2: 20,000 gallon pool, diamond bright
    FC - 1
    TC - 1
    PH - 7.8/2
    ALK - 90
    CH - 310
    CYA - 60
    NITRATES - 1
    AMMONIA - 0

    This pool takes 2.5 gallons of chlorine per week and 1 chlorine tab. Usually has the same PH upon return every time.

    FC - 0
    TC - .5
    PH - 7.8/3
    ALK - 110
    CH - 250
    CYA - 40
    NITRATES - 0
    AMMONIA - 0

    This pool takes 2.5 gallons of chlorine per week and 1 chlorine tab. PH usually goes up to 7.8/1 - 7.8/3 every week.

    POOL 4: 16,000 gallon vinyl inground pool

    FC - 0
    TC - .5
    PH - 7.8/4
    ALK - 100
    CH - 260
    CYA - 45
    NITRATES - 10
    AMMONIA - 0

    This pool I just started last week and was frog pond green. I treated with shock and phosphate remover then realized it had level 10 nitrates. I am going to drain half the pool and refill. It will not hold chlorine at all, I am going threw 2.5 gallons a day.

    With these pool I am going out of my mind. I am going threw so much chlorine its not funny. I have tested and treated for everything I know how to. Any help is much appreciated.

  2. Back To Top    #2
    alanpaul's Avatar
    Join Date
    Aug 2010
    South Florida

    Re: Cant keep chlorine in pool!

    Hi, Ryan H Matata!

    Let me be the first to welcome you to TFP.

    And the first to recommend you press the button, above right, and read Pool School.
    If you look at the complete table of contents, you will find articles that will address your issues.

    Note: If the pools are consuming lots of chlorine, they've most likely got organic (ie. algae) problems.
    See the article on the Shock Process. The process takes a lot of chlorine, hour after hour, for several days, but it beats back the algae, balances the chemicals, and gets the water sparkling.

    Welcome and good luck.

    I'm sure others here, more experienced than I, can give you more specific directions.
    Alan in Wellington, FL - near West Palm Beach
    15,200 gal IG, painted plaster, 1988; 200 SqFt cartridge filter, 2013; 1.5 HP 1-speed pump (uprated), 2005; heat pump, 2005;
    soon to repair (dead) SWG AquaRite T-15 cell, 2005, and replace (dead) suction-side cleaner, 2005.
    Almost everything died this winter 2012-'13, and I know we shouldn't complain... but, Arrgh!

  3. Back To Top    #3

    Join Date
    Jun 2011
    Long Beach, CA

    Re: Cant keep chlorine in pool!

    I'm guessing the pools are using a little more than average chlorine due to a lower CYA value and needing to raise the chlorine level really high once a week. At the high FC levels the chlorine will be used up at a faster rate than normal so this rate of decline is expected. Pool 1 is averaging 4 ppm loss a day, pool 2 is doing just fine at 2.5 ppm loss a day, and pool 3 is the worst at 7 ppm a day. Pool 2 is the best and has the highest CYA and pool 3 is the worst and it has the lowest CYA.

    When the FC gets low, the pools probably start growing algae, not blooming, and then when you raise the chlorine, it gets consumed faster by the algae and also at a higher rate due to the high level of chlorine.

    Some services that can only visit their pools once a week raise their CYA on the high side, 100 ppm, so the chlorine is protected more. Do a search, Chem Geek has written a lot on this throughout the boards. You might try raising the CYA some and see if they don't improve for you. A pool service company that services once a week in FL needs to run a little different than what is taught to the home owner, but TFP is a great resource to really understand what is happening with the pool's chemistry and equipment.
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
    Hayward Aqua Rite T-15 SWCG, Jandy LXi 400k BTU NG heater, 350 sq.ft. of Sun Star solar panels, TF-100 Test Kit, Dolphin s300i Cleaner
    Test Kits . Pool Math . Chlorine/CYA Chart . The SLAM Process

  4. Back To Top    #4
    Butterfly's Avatar
    Join Date
    May 2007
    South Carolina

    Re: Cant keep chlorine in pool!

    Welcome to the forum

    Before you think about raising CYA, you should complete the shock process.

    What test kit are you using?
    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!

  5. Back To Top    #5
    harleysilo's Avatar
    Join Date
    Mar 2012
    North Georgia

    Re: Cant keep chlorine in pool!

    Welcome! Keep reading and learning here. Search for user frustratedpoolmom, she services pools and has posted a lot of info on how she accomplishes it. I love seeing small business people showing up here and learning and improving their company and service. Knowledge is power, once you get a grasp of the chemistry you'll understand what to add, what to ignore, and be able to communicate that better to the customer.

    If I owned a pool service I would explain to customers what the pool really needs, and how no service can afford to do it with out charging prices people wouldn't pay. Get them involved enough to maybe dump some bleach in two three times a week. That would make things tons better. Might loose some customers but I doubt it. Just leave a pre measured bottle that says pour me Tuesday evening....
    18'x43' Sport Pool
    19,000 Gallons Vinyl Liner 3'-3.5'-4'
    SWCG and D.E. Filter
    Test Kits - Pool Calculator - Chlorine/CYA Chart - Pool School

    Secret Weapon for Pool Chemistry Testing

Posting Permissions

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