Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 10 of 10

Thread: Should I Need to add any chlorine to cold water?

  1. Back To Top    #1

    Join Date
    Apr 2015
    Location
    South Central PA
    Posts
    296

    Should I Need to add any chlorine to cold water?

    This is my second year with a pool. I'm still learning and trying to insure everything seems right. I set up a Stenner this season, and I'm adding about 7 oz of 8.25% bleach per day. This is about a .25FC loss per day. The solar cover is on full time, and the water temp is in the mid to upper 50's (it's been pretty cold for this time of year). With these temperatures, should I need to add any bleach at all? I ask because I hear people talking about FC lasting through the winter. At this rate of loss, I would be out of FC in about 1.5 months after the closing SLAM (I had 0 FC on opening with a mesh cover). If this seems right, it's fine, but if it seems off I'd start an algae search.
    20000 gallon vinyl liner in ground pool
    16' X 34' rectangular diving pool
    Hayward Pro Grid DE Filter
    Hayward 1 hp Super Pump
    TF-100 Test Kit Stenner 45MPHP10

  2. Back To Top    #2

    In the Industry

    Donldson's Avatar
    Join Date
    Jun 2009
    Location
    NW Ohio
    Posts
    2,637

    Re: Should I Need to add any chlorine to cold water?

    Your solar cover is blocking some, but not all of the UV from the sun. So I would expect a very small FC loss similar to what you are noticing. Remember, the sun is just as powerful now as it is in mid-July (that is to say, same position overhead).

    If you are worried you can try an OCLT, but I really think you can chalk the loss up to solar breakdown.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
    Pool School - PoolMath - HIGHLY Recommended Test Kits

  3. Back To Top    #3

    Join Date
    Apr 2015
    Location
    South Central PA
    Posts
    296

    Re: Should I Need to add any chlorine to cold water?

    Thanks...just wanted to see is it made sense. I wouldn't really be able to pick up that loss with the FAD/DPD, as that's in .5 FC increments...I guess if I really wanted to I could do a 20ml sample, but I'm not that concerned if it seems in line with what's expected....
    20000 gallon vinyl liner in ground pool
    16' X 34' rectangular diving pool
    Hayward Pro Grid DE Filter
    Hayward 1 hp Super Pump
    TF-100 Test Kit Stenner 45MPHP10

  4. Back To Top    #4

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,077

    Re: Should I Need to add any chlorine to cold water?

    I am not sure what the goal is. Your Stenner seems to be working fine.....why are you considering adding chlorine? I think I am misunderstanding part of your post.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  5. Back To Top    #5

    TFP Guide

    Kiss4aFrog's Avatar
    Join Date
    May 2013
    Location
    Hudson, WI
    Posts
    2,602

    Re: Should I Need to add any chlorine to cold water?

    Maybe you could do a CC test and if it's where it should be, under 0.5 you know everything is good and that 7oz is an accurate daily amount.
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

  6. Back To Top    #6

    Join Date
    Apr 2015
    Location
    South Central PA
    Posts
    296

    Re: Should I Need to add any chlorine to cold water?

    Quote Originally Posted by duraleigh View Post
    I am not sure what the goal is. Your Stenner seems to be working fine.....why are you considering adding chlorine? I think I am misunderstanding part of your post.
    As I mentioned, people go the entire winter and still end up with FC upon opening, due at least partially to cold water. I'm simply asking if I should even need to add the 7 oz that the Stenner is adding, or should my chlorine consumption be about zero with the cold water. No intention of adding FC in addition to the Stenner.
    20000 gallon vinyl liner in ground pool
    16' X 34' rectangular diving pool
    Hayward Pro Grid DE Filter
    Hayward 1 hp Super Pump
    TF-100 Test Kit Stenner 45MPHP10

  7. Back To Top    #7

    Join Date
    Jul 2012
    Location
    Chicago, IL
    Posts
    334

    Re: Should I Need to add any chlorine to cold water?

    With water in the 50s and a solar cover, your chlorine consumption could in fact be near zero and you may not need to add anything at all, so nothing unreasonable about the results you are seeing. Ultimately though, your test results will tell you what you need to add. Has your FC been holding steady or showing slight increases each day with the addition of 7 oz (about 0.2ppm for your pool)?
    Dedicated TFPer since 2012 with recommended test kit
    Above ground, 30 foot round pool, 21,000 gallons
    Hayward 150 sq foot cartridge filter, 1HP Waterway pump
    Raypak 400K BTU NG Heater!
    Installed in 2006? (just a guess, pool came with house I purchased in June 2012)

  8. Back To Top    #8

    Join Date
    Apr 2015
    Location
    South Central PA
    Posts
    296

    Re: Should I Need to add any chlorine to cold water?

    It's been holding steady....probably about 3 weeks of 7oz per day maintains it at 4ppm.
    20000 gallon vinyl liner in ground pool
    16' X 34' rectangular diving pool
    Hayward Pro Grid DE Filter
    Hayward 1 hp Super Pump
    TF-100 Test Kit Stenner 45MPHP10

  9. Back To Top    #9

    Join Date
    Jul 2012
    Location
    Chicago, IL
    Posts
    334

    Re: Should I Need to add any chlorine to cold water?

    Sounds like at the moment you are replacing roughly what you are consuming. Assuming your target is 4 (which implies a CYA of 30) I'd just keep on keeping on as is, knowing that as it warms, swimmers get in, and that cover spends more time off your consumption will increase.
    Dedicated TFPer since 2012 with recommended test kit
    Above ground, 30 foot round pool, 21,000 gallons
    Hayward 150 sq foot cartridge filter, 1HP Waterway pump
    Raypak 400K BTU NG Heater!
    Installed in 2006? (just a guess, pool came with house I purchased in June 2012)

  10. Back To Top    #10

    Join Date
    Apr 2015
    Location
    South Central PA
    Posts
    296

    Re: Should I Need to add any chlorine to cold water?

    Thanks...sounds like I'm relatively on track with what should be expected.
    20000 gallon vinyl liner in ground pool
    16' X 34' rectangular diving pool
    Hayward Pro Grid DE Filter
    Hayward 1 hp Super Pump
    TF-100 Test Kit Stenner 45MPHP10

Posting Permissions

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