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

Thread: Chlorine management

  1. Back To Top    #1

    Join Date
    May 2016
    Location
    South Lyon, MI
    Posts
    1

    Chlorine management

    I'm new to the site this year. My water seems to be in good shape, but I need to get a better feel for managing the chlorine level.
    I have a New Water auto chlorinator with a variable setting that I can adjust from 0-10. I have it set at 5.
    My CC is has been under 0.5 for a week, but the FC is dropping daily by 1 ppm per day (pear tree stems that I keep vacuuming out).
    Today I have FC=1, CC=0. CYA =45. pH=7.5. TA=120. CH=150.
    Looking at the chart, I should have added some liquid chlorine when the FC dropped to 3-4 based on the 45 CYA? But how much?
    Since I didn't, and FC is now 1, do I need to SLAM?
    IG Vinyl 24,000 Gallons, FNS 36 DE Filter, 1HP Sta-Rite, Pentair 250 Gas Heat, New Water Chlorinator, TF-100 kit, 2016 new liner/water

  2. Back To Top    #2

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,085

    Re: Chlorine management

    Use PoolMath. it will tell you exactly how much to add to get back to a certain FC.

    That said, are you chlorinating with pucks?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Location
    Columbia, SC
    Posts
    8,497

    Re: Chlorine management

    Are you still adding chlorine pacs to the "New Water Chlorinator"?

    According to the NEW WATER CYCLER PAC MSDS the pacs contain -"SYNONYMS -Trichloroisocyanuric Acid, TCCA, Trichlor, Trichloro- s-triazinetrione"

    If you are still using them this is going to drive your CYA through the roof as Trichlor is almost half CYA.

    With your current CYA of 50 (There is no 45 on the scale) your FC sholuld NEVER go below 4 and you should target 6 to keep it above 4 as the UV depletes the FC during the day.

    You say the water "seems to be in good shape". Does this mean it's clear? Any visible algae?

    We determine the need to SLAM a pool based on organics consuming the chlorine. Only two things cause a reduction of FC levels - UV form the sun and organics. So to see if there are organics consuming your chlorine we conduct an Overnight FC Loss Test (OCLT). With the pump running add sufficient liquid chlorine to bring your target of 6 and perform the OCLT after the sun sets. Remember, turn your auto-chlorinator off if it is still on when running this test.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

  4. Back To Top    #4

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,085

    Re: Chlorine management

    If you are using the pucks (you should stop) then you can bring the FC back up by a specific dosage of liquid chlorine into your pool. You can manage your FC much more precisely with liquid chlorine and you can avoid over stabilizing by stopping the use of tri-chlor.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , 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
  •