Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 12 of 12

Thread: SWG Winter and Cold Water

  1. Back To Top    #1

    SWG Winter and Cold Water

    I am getting a low salt message on my pool. During the winter I just use a floater/pucks for chlorine, is there any reason I should add salt now? Or is it okay until I wait for it to warm up.
    15k freeform shotcrete sport pool 3.5-5-4, hayward swimclear c4030, 1.5hp hayward Northstar pump, polaris 280 with hayward booster, hayward turbo cell swg

  2. Back To Top    #2

    Join Date
    Jun 2011
    Location
    Long Beach, CA
    Posts
    2,670

    Re: SWG Winter and Cold Water

    Most likely you are getting false readings due to the cold water. Wait until the water warms up and check your salt level then. Do not rely only on the reading you get on the SWG, always test with strips to confirm that the SWG is correct before adding salt. Too many times the sensors or cells are failing and the salt level is fine where it is at.
    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

  3. Back To Top    #3
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,486

    Re: SWG Winter and Cold Water

    Quote Originally Posted by ping
    Do not rely only on the reading you get on the SWG, always test with strips to confirm that the SWG is correct before adding salt.
    I would agree with this only under certain circumstances. Normally, you should always rely upon what the SWG is telling you because that is what matters most. If the SWG is happy and generating chlorine, then all is good. There are only two conditions where a SWG will give a false reading:

    1) The cell is failing. This is usually indicated by the "Low Salt" warning occurring more often than normal.

    2) The water is cold, as in the this case, AND the SWG is known not to compensate the readout for cold water. BTW, what brand/model do you have?

    Other than these two conditions, I would rely upon the SWG readout.

    Also, salt strips can give erroneous reading as well and tend to go bad quickly if not stored properly. Plus I find that they are not as accurate as a drop kit and tend to read on the high side.
    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

  4. Back To Top    #4

    Re: SWG Winter and Cold Water

    It is a Hayward Turbocell T9. I believe it was reading 2200ppm, I know it's too cold to generate chlorine, but wasnt sure if I needed to add salt now or wait until it warms up.
    15k freeform shotcrete sport pool 3.5-5-4, hayward swimclear c4030, 1.5hp hayward Northstar pump, polaris 280 with hayward booster, hayward turbo cell swg

  5. Back To Top    #5
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,486

    Re: SWG Winter and Cold Water

    The Hayward units have temperature compensation for the salt readout. Mine is fairly accurate down to 50 degrees. Below that the unit doesn't generate salt anyway.

    One thing I forgot to ask is the cell age. Failing cells tend to read low salt.

    But, if you have had a lot rain over the winter that required pumping out of the pool or overflowed into an overflow drain, that will lower the salt level and would be a reasonable explanation for the lower salt level. If this is the case, then it is probably safe to add salt.
    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

  6. Back To Top    #6

    Re: SWG Winter and Cold Water

    The lower salt is most likely due to the rain we have had. The unit is only a year old. The water/temp is too low to generate salt, that was the reason I was asking if I should bother adding the salt now or wait a month or two for the water to warm up. My pool is hanging right around 42-45 degrees.
    15k freeform shotcrete sport pool 3.5-5-4, hayward swimclear c4030, 1.5hp hayward Northstar pump, polaris 280 with hayward booster, hayward turbo cell swg

  7. Back To Top    #7
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,486

    Re: SWG Winter and Cold Water

    If the water is not warm enough to generate then there is no harm to wait until the water warms up. I agree that it was probably the rain. That will do it every time.
    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

    In the Industry

    Join Date
    Feb 2013
    Posts
    7

    Re: SWG Winter and Cold Water

    The reason for the low salt reading is the water temperature. At that water temperature the unit is probably calculating salt at about half of the actual reading. Almost all units shut down at water temperatures below 60 to 70 degrees. There are a couple that will generate at any water temperature. For those units you don't adjust the salt level you simply run the unit. The electro chemical reaction is a function of water temperature so production will be reduced but you will still be generating chlorine. The good news is that cold water slows algae growth so chlorine demand is reduced as well. If you add salt to increase production, you will be in trouble when the water warms up. The only way to reduce salt levels is to dump water and refill. Not a great thing to have to do. Salt test strips a okay for a rough calculation of salt in a pool. I have found them to be out as much as 1000 ppm at times. The best is a digital probe with temperature compensation. There are also some good drop kits that are accurate as well

    Mark _Watermaid
    Serious Showcase Pool "I'm a builder, what can I say...." 5 - Intelliflo VS Pumps, 2 - Intelliflo XF VS Pumps, 1 - SPECK 450GPM 5HP Pump, 2 - SPECK 400GPM 4HP Badu SwimJet System, 3 - 520 Pentair Cartridge Filter, 6 - Pentair Intellibrite 5G Color LED Lights, 3 - Pentair LED Laminars, 2 - Pentair 400K BTU Heaters, 1 - Pentair UltraTEMP Heat/Cool Pump, Pentair Commercial Salt System (IC-60 x 3), Pentair Intellitouch i9+3, i10x, Screenlogic2 w/ Mobiletouch Remote, iPad, iPod, & iPhone Remotes, 3 - Pentair SpaCommand Remotes, Pentair IntelliCHEM w/ Stenner Pump/Tank upgrade, Paramount PV3 Infloor Cleaning System (52 heads), 3 - Paramount Clear O3 Ozone, 2 - Bullfrog Spa JetPaks (for Gunite Spa), 14 - Waterway Spa Therapies, 3 - Paramount MDX3 Maindrain, 1 - 3' x 10' x 2" Acrylic View Panel @ Swimup bar, 1 - 16' Custom Interfab Slide w/ 25 Ton Natural & Artificial Rock Combo Cave.

    Landscape & Patio? Only have 980 character limit!....

  9. Back To Top    #9

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,083

    Re: SWG Winter and Cold Water

    Hi, Mark,

    Welcome to the forum.

    Dave
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  10. Back To Top    #10
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,486

    Re: SWG Winter and Cold Water

    Quote Originally Posted by Mark_Watermaid
    The reason for the low salt reading is the water temperature. At that water temperature the unit is probably calculating salt at about half of the actual reading.
    The Hayward/Goldline units compensate salt readout for water temperature. Mine reads the same salt level from 50-105 deg F. Not all SWGs do this but the Goldline units do.
    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

  11. Back To Top    #11

    In the Industry

    Join Date
    Feb 2013
    Posts
    7

    Re: SWG Winter and Cold Water

    Thanks Dave.

    Thanks Mark Good to know. I also believe that Hayward/Goldline units shut down at water temperatures below 60 degrees

    Mark
    Serious Showcase Pool "I'm a builder, what can I say...." 5 - Intelliflo VS Pumps, 2 - Intelliflo XF VS Pumps, 1 - SPECK 450GPM 5HP Pump, 2 - SPECK 400GPM 4HP Badu SwimJet System, 3 - 520 Pentair Cartridge Filter, 6 - Pentair Intellibrite 5G Color LED Lights, 3 - Pentair LED Laminars, 2 - Pentair 400K BTU Heaters, 1 - Pentair UltraTEMP Heat/Cool Pump, Pentair Commercial Salt System (IC-60 x 3), Pentair Intellitouch i9+3, i10x, Screenlogic2 w/ Mobiletouch Remote, iPad, iPod, & iPhone Remotes, 3 - Pentair SpaCommand Remotes, Pentair IntelliCHEM w/ Stenner Pump/Tank upgrade, Paramount PV3 Infloor Cleaning System (52 heads), 3 - Paramount Clear O3 Ozone, 2 - Bullfrog Spa JetPaks (for Gunite Spa), 14 - Waterway Spa Therapies, 3 - Paramount MDX3 Maindrain, 1 - 3' x 10' x 2" Acrylic View Panel @ Swimup bar, 1 - 16' Custom Interfab Slide w/ 25 Ton Natural & Artificial Rock Combo Cave.

    Landscape & Patio? Only have 980 character limit!....

  12. Back To Top    #12
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,486

    Re: SWG Winter and Cold Water

    Goldline units shut down at 50 degrees.
    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

Posting Permissions

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