Become a TFP Supporter Welcome to our new server and new forum software. Pool School
Results 1 to 13 of 13

Thread: Chlorine drop test

  1. #1
    Member fordsbyjay's Avatar
    Join Date
    Sep 2009
    Location
    Lafayette, LA
    Posts
    59

    Chlorine drop test

    When I add my DPD powder I don't get any change in color. Is this because I have no chlorine at all? My powder was old and turned black so I ordered a new container and it does the same thing with the new powder as well.
    19000 gallon inground fiberglass pool
    Hayward Pro Series Sand filter S244T 62 gal/min
    Whisper Flow WFE-2 / 011511 1/2 hspr pump
    Aqua Rite Pro SWG, T9 cell for 25000 gal

  2. #2
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    20,973

    Re: Chlorine drop test

    Do you have an OTO test kit? If so, check the chlorine with that. If there's any chlorine in there it'll turn some color.

    What are you running the swg at?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 1.5hp Dynamo pump. 24" Pentair Sand Dollar Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit
    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

  3. #3
    Senior Member UnderWaterVanya's Avatar
    Join Date
    Jun 2012
    Location
    Mint Hill, NC
    Posts
    2,595

    Re: Chlorine drop test

    FAS-DPD can report false negative (so I have read) and as Bama says above the OTO test (yellow side of the Taylor K1000 test block) is very reliable for showing if you have any chlorine.
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

  4. #4
    Member fordsbyjay's Avatar
    Join Date
    Sep 2009
    Location
    Lafayette, LA
    Posts
    59

    Re: Chlorine drop test

    I have the TF-100 kit and it includes the Taylor K1000 test block. I did the test with that as well and I have no chlorine. My question, I guess, is more directed towards the R-0870 DPD powder. How come it doesn't change to pink (or any color) when I add it?
    19000 gallon inground fiberglass pool
    Hayward Pro Series Sand filter S244T 62 gal/min
    Whisper Flow WFE-2 / 011511 1/2 hspr pump
    Aqua Rite Pro SWG, T9 cell for 25000 gal

  5. #5
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    20,973

    Re: Chlorine drop test

    If there's zero chlorine in the pool it won't change color because there's nothing to bind to. There has to be chlorine for the dye to work.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 1.5hp Dynamo pump. 24" Pentair Sand Dollar Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit
    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

  6. #6
    Senior Member
    Join Date
    Jan 2012
    Posts
    362

    Re: Chlorine drop test

    Quote Originally Posted by fordsbyjay
    When I add my DPD powder I don't get any change in color. Is this because I have no chlorine at all? My powder was old and turned black so I ordered a new container and it does the same thing with the new powder as well.
    If you added the two scoops it pretty much means chlorine is zero. Put a couple drops of bleach in the sample and see what happens.
    17,800 gallon, IG pool, 595 sq feet (17x35x4.5 avg rectangle), Hayward 525 cartridge filter, diamondbrite, 2 hp 2 speed hayward tristar filter, Stenner 45mhp10 automatically chlorinating

  7. #7
    Member fordsbyjay's Avatar
    Join Date
    Sep 2009
    Location
    Lafayette, LA
    Posts
    59

    Re: Chlorine drop test

    Ok thanks. I guess I have just never been that low before that there was no color change. I figured I was doing something wrong or there was a problem.
    19000 gallon inground fiberglass pool
    Hayward Pro Series Sand filter S244T 62 gal/min
    Whisper Flow WFE-2 / 011511 1/2 hspr pump
    Aqua Rite Pro SWG, T9 cell for 25000 gal

  8. #8
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    22,801

    Re: Chlorine drop test

    Well ... technically you are doing something wrong and there is a problem ... not checking the FC often enough and letting it drop to zero

    At this point, it seems that you need to start performing the shock process ... or at least raise to shock level and perform the OCLT to determine if there are organics in the pool consuming the FC as fast as the SWG can generate it.
    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, Dolphin Diagnostic Robotic Cleaner, TF-100 test kit w/ SpeedStir
    Gone: Hayward RS1500 pump, undersized DIY solar heater, Dolphin Dynamic Robotic Cleaner
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  9. #9
    Senior Member UnderWaterVanya's Avatar
    Join Date
    Jun 2012
    Location
    Mint Hill, NC
    Posts
    2,595

    Re: Chlorine drop test

    Quote Originally Posted by march2012
    Quote Originally Posted by fordsbyjay
    When I add my DPD powder I don't get any change in color. Is this because I have no chlorine at all? My powder was old and turned black so I ordered a new container and it does the same thing with the new powder as well.
    If you added the two scoops it pretty much means chlorine is zero. Put a couple drops of bleach in the sample and see what happens.

    Another option if you have chlorinated tap water - drop some into the sample when you see no color change - it should immediately turn pink when you add the chlorinated tap water.
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

  10. #10
    Member fordsbyjay's Avatar
    Join Date
    Sep 2009
    Location
    Lafayette, LA
    Posts
    59

    Re: Chlorine drop test

    I went and had my T9 cell tested and it Failed which I guess explains the no chlorine situation...

    thank you for the replies.
    19000 gallon inground fiberglass pool
    Hayward Pro Series Sand filter S244T 62 gal/min
    Whisper Flow WFE-2 / 011511 1/2 hspr pump
    Aqua Rite Pro SWG, T9 cell for 25000 gal

  11. #11
    Senior Member UnderWaterVanya's Avatar
    Join Date
    Jun 2012
    Location
    Mint Hill, NC
    Posts
    2,595

    Re: Chlorine drop test

    Quote Originally Posted by fordsbyjay
    I went and had my T9 cell tested and it Failed which I guess explains the no chlorine situation...

    thank you for the replies.
    Grab some bleach while you are waiting to get it fixed or replaced.
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

  12. #12
    Member fordsbyjay's Avatar
    Join Date
    Sep 2009
    Location
    Lafayette, LA
    Posts
    59

    Re: Chlorine drop test

    Quote Originally Posted by UnderWaterVanya
    Quote Originally Posted by fordsbyjay
    I went and had my T9 cell tested and it Failed which I guess explains the no chlorine situation...

    thank you for the replies.
    Grab some bleach while you are waiting to get it fixed or replaced.
    That is exactly what I did. Thanks.
    19000 gallon inground fiberglass pool
    Hayward Pro Series Sand filter S244T 62 gal/min
    Whisper Flow WFE-2 / 011511 1/2 hspr pump
    Aqua Rite Pro SWG, T9 cell for 25000 gal

  13. #13
    Senior Member
    Join Date
    Mar 2011
    Posts
    3,124

    Re: Chlorine drop test

    If you don't get a color change when adding the R-0870, you should then add 5 drops of R-0003 to see if you have any combined chlorine.

Posting Permissions

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