Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 5 of 5

Thread: Chlorine Test

  1. Back To Top    #1

    Chlorine Test

    Hello Again,

    I have been maintaining my new to me pool for a month or two now and I am very satisfied and comfortable with the pool thanks to the knowledge I have gained from TFP forum and I thank you all for that knowledge. But I digress.

    I find that I only use the R-0870 DPD powder and the R-0871 drops to daily check my chlorine. I never use the the yellow capped R-0003 drops to check my chlorine. Is the DPD test more accurate than the R-0003 test? It certainly is easier for me to read the R-870/R-871 test.
    Many Thanks,
    Russ Stevenson
    10k in ground plaster
    Build date around 1980
    1.0 HP pump, Baker Hydropak Skimmer

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Chlorine Test

    The OTO (yellow) test is fool proof on determining if there is 0 chlorine in the pool (clear) ... or a LOT of chlorine in the pool (yellow to orange to brown).

    If your required FC levels are low enough, you can get by with the OTO test on a daily basis and use the FAS-DPD test less often to get specific numbers.

    There is nothing wrong with always using the FAS-DPD test as it is much more accurate ... other than running out of reagents
    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!

  3. Back To Top    #3
    BoDarville's Avatar
    Join Date
    Jun 2012
    Location
    DFW, Texas
    Posts
    3,840

    Re: Chlorine Test

    Quote Originally Posted by russ.stevenson
    I find that I only use the R-0870 DPD powder and the R-0871 drops to daily check my chlorine. I never use the the yellow capped R-0003 drops to check my chlorine. Is the DPD test more accurate than the R-0003 test? It certainly is easier for me to read the R-870/R-871 test.
    The R-0870 powder combined with the R-0871 drops test FC. After recording the FC, the R-0003 is added to the R-0870/R-0871 solution to test for Combined Chloramines (CC). If the solution remains clear, you have no CCs (this is good). If the solution turns pink, add R-0871 to the solution, counting and swirling between each drop. Once the solution returns clear, multiply the added drops times .5 again - this is your CC. The amount of CC is a determining factor in whether to shock.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

  4. Back To Top    #4
    frogabog's Avatar
    Join Date
    Jul 2010
    Location
    Portland, Oregon
    Posts
    1,578

    Re: Chlorine Test

    You should be using the R-0003 to test for Total Chlorine, after you test for Free Chlorine with R-0870 and R-0871. After you are done testing by dropping R-0871 in and the water is clear again, put 5 drops of R-0003 in the same sample. If it turns pink, then you drop R-0871 in again drop by drop and count till it turns clear again.

    Take the result of the R-0870 and R-0871 reading and add the drops you used in the second phase after using R-0003. This is your Total Chlorine (TC) result.

    So, let's say you used 8 drops of R-0871 for a result of 4ppm Free Chlorine first, then added R-0003 and it turned pink. Let's say it took 2 drops to turn back to clear. Your results would be as follows.

    FC = 4ppm
    TC = 5ppm
    CC = 1ppm

    In this case, since CC is over .5ppm, you would need to begin the shocking process.

    If the sample doesn't turn pink after adding R-0003, your CC result is 0ppm.

    The reagent you would want to use for the OTO test is found in the blue box that is in your TF100, I think it's R-0450 or something (hard to read the label on the image). But it isn't R-0003, that won't work for the OTO.
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

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

    Re: Chlorine Test

    Thanks for clarifying ... obviously I read the original post wrong
    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!

Posting Permissions

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