Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 8 of 8

Thread: new Solar Heater - questions about Chlorine Usage and SWG

  1. Back To Top    #1

    Join Date
    Feb 2010
    Location
    South Florida
    Posts
    73

    new Solar Heater - questions about Chlorine Usage and SWG

    Hello. I just had solar panels installed. I have a 2-speed pump, and the solar controller is set up to switch the pump into high speed when solar heating is needed. When my pool was set up, the installers set it so that the salt water chlorinator only runs in low-speed mode. Their explanation as to why wasn't a great one, but at the time it didn't matter.

    Now that I have the chlorinator, it does, as the pool will be running more, and in winter a lot, in high-speed mode. The tech who installed the panels had many misconceptions about pool functioning, so I take what he said with a great degree of suspicion, but when I asked him about whether to have the chlorinator run in high-speed mode too, he said:
    • The amount of chlorine produced is similar in high and low speed modes, i.e. it is independent of the speed of the pump
      The hotter water will consume more chlorine.


    I read a post on here that JasonLion said that hotter water does use more chlorine. However it was my impression overall that UV consumes chlorine. My fear with turning the chlorinator on in high speed was that if the output of chlorine went up because of the high-speed, and in cooler/less sunny months the heater would run more, that my chlorine could quickly get high with a temperature drop. But if the output is the same, I will just need to to adjust the chlorine % just a little. And more chlorine consumption because of the higher water temperature balances a little the less chlorine consumption because of less UV in the cooler periods.

    Would you guys agree that I should have the system settings changed to run the chlorinator in high-speed mode too?
    15.5 k gallon. IG. plaster. Pool/spa pump: Jandy Zodiac FloPro FHPM 2.0-2 (0.25 and 2.0 HP 2-speed). Water feature pump: Jandy Zodiac Stealth Pro Series, SHPF 3.0 (3.0 HP). Filter: 250 SF cartridge. Surface area 290 SF. Jandy AquaPure SWG and PureLink. Aqualink controls. Jandy Legacy Pool and Spa Heater by Zodiac 400,000 BTU - natural gas. Heliocol solar panels. Built 3/2013.

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

    Re: new Solar Heater - questions about Chlorine Usage and SW

    Pump speed doesn't matter for swg chlorine production, unless the flow is too low for the swg flow sensor. I would run the pump on high when solar heating, and on low for the rest of the time.
    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
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: new Solar Heater - questions about Chlorine Usage and SW

    Quote Originally Posted by linen
    Pump speed doesn't matter for swg chlorine production, unless the flow is too low for the swg flow sensor. I would run the pump on high when solar heating, and on low for the rest of the time.
    That is what I do
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  4. Back To Top    #4

    Join Date
    Feb 2010
    Location
    South Florida
    Posts
    73

    Re: new Solar Heater - questions about Chlorine Usage and SW

    Thanks, guys.

    Any ideas about chlorine consumption, whether it's just UV that consumes the chlorine in the pool, or whether heat from a hotter (solar heated) pool is an additional factor in determining chlorine consumption?
    15.5 k gallon. IG. plaster. Pool/spa pump: Jandy Zodiac FloPro FHPM 2.0-2 (0.25 and 2.0 HP 2-speed). Water feature pump: Jandy Zodiac Stealth Pro Series, SHPF 3.0 (3.0 HP). Filter: 250 SF cartridge. Surface area 290 SF. Jandy AquaPure SWG and PureLink. Aqualink controls. Jandy Legacy Pool and Spa Heater by Zodiac 400,000 BTU - natural gas. Heliocol solar panels. Built 3/2013.

  5. Back To Top    #5
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: new Solar Heater - questions about Chlorine Usage and SW

    Chlorine is consumed by 2 things. The sun and organics in the pool. The water temp changes the ability of stuff to start growing, you will need more chlorine when the water is warmer.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  6. Back To Top    #6

    In the Industry

    ps0303's Avatar
    Join Date
    Jul 2011
    Location
    FL
    Posts
    3,436

    Re: new Solar Heater - questions about Chlorine Usage and SW

    Keep an eye on your stabilizer, cyanuric acid, as well. It helps protect the chlorine. You also need to make sure your pump runs enough hours for the chlorinator to create enough chlorine for the pool.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

  7. Back To Top    #7
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,487

    Re: new Solar Heater - questions about Chlorine Usage and SW

    Water temperature is also a factor in chlorine consumption. It is discussed in this this thread: pool-water-chemistry-t628.html
    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

  8. Back To Top    #8

    Join Date
    Feb 2010
    Location
    South Florida
    Posts
    73

    Re: new Solar Heater - questions about Chlorine Usage and SW

    thanks
    15.5 k gallon. IG. plaster. Pool/spa pump: Jandy Zodiac FloPro FHPM 2.0-2 (0.25 and 2.0 HP 2-speed). Water feature pump: Jandy Zodiac Stealth Pro Series, SHPF 3.0 (3.0 HP). Filter: 250 SF cartridge. Surface area 290 SF. Jandy AquaPure SWG and PureLink. Aqualink controls. Jandy Legacy Pool and Spa Heater by Zodiac 400,000 BTU - natural gas. Heliocol solar panels. Built 3/2013.

Posting Permissions

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