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

Thread: Testing very high chlorine levels > 50 ppm

  1. Back To Top    #1

    Join Date
    May 2012
    Location
    Greensboro NC
    Posts
    84

    Testing very high chlorine levels > 50 ppm

    I need to chlorinate my well, and have a TF-50 test kit.

    According to people who know things about wells, I need to get 100ppm at the well head.

    Can the FAS-DPD test be used for levels this high? If so, any ideas on not wasting reagent.

    Thanks.
    24,000 gallon
    Vinyl Liner
    In Ground Pool
    Hayward super pump 1hp
    Hayward S220T 250lb. Sand Filter

  2. Back To Top    #2

    Join Date
    Oct 2013
    Location
    Adelaide, Australia
    Posts
    77

    Re: Testing very high chlorine levels > 50 ppm

    Dilute it in the ratio x:y, (say 5:1) with non chlorinated water and multiply the answer by x+y, (6) ?
    Steven
    18.5k US gallon/69kl IG tiled with an Onga Pantera 25" sand filter, powered by a Davey Silensor 200 1HP/0.75kW pump coupled to a Zodiac TRi (mid) SWG K-2006C Test kit imported from the USA...
    in Adelaide, Australia...

  3. Back To Top    #3

    In the Industry

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

    Re: Testing very high chlorine levels > 50 ppm

    You should be able to calculate the gallons of water in your well and then simply dose enough using PoolMath to get very close to that target.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4

    Join Date
    May 2012
    Location
    Greensboro NC
    Posts
    84

    Re: Testing very high chlorine levels > 50 ppm

    Quote Originally Posted by duraleigh
    You should be able to calculate the gallons of water in your well and then simply dose enough using PoolMath to get very close to that target.
    I have done that part already, but for peace of mind I wanted to test the level at the well head.

    Can anybody confirm the math for the FAS-DPD test?

    Thank you.
    24,000 gallon
    Vinyl Liner
    In Ground Pool
    Hayward super pump 1hp
    Hayward S220T 250lb. Sand Filter

  5. Back To Top    #5
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: Testing very high chlorine levels > 50 ppm

    It can only test that high with dilution of the test. Unfortunately, you lose accuracy this way and a lot of it when you dilute samples for testing FC. I'm not sure why they think you need 100 PPM FC, but that seems excessive to me. Is your well badly contaminated with something?
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  6. Back To Top    #6

    Join Date
    May 2012
    Location
    Greensboro NC
    Posts
    84

    Re: Testing very high chlorine levels > 50 ppm

    Well tested positive for ecoli and fecal coliform.

    Only posting the whole thing because I found it interesting:
    15A NCAC 02C .0111 DISINFECTION OF WATER SUPPLY WELLS
    (a) Any person constructing, repairing, testing, or performing maintenance, or installing a pump in a
    water supply well shall disinfect the well upon completion of construction, repairs, testing,
    maintenance, or pump installation.
    (b) Any person disinfecting a well shall perform disinfection in accordance with the following
    procedures:
    (1) Chlorination.
    (A) Hypochlorite shall be placed in the well in sufficient quantities to produce a
    chlorine residual of at least 100 parts per million (ppm) in the well.
    Stabilized chlorine tablets or hypochlorite products containing fungicides,
    algaecides, or other disinfectants shall not be used. Chlorine test strips or
    other quantitative test methods shall be used to confirm the concentration of
    the chlorine residual.
    [Note: About three ounces of hypochlorite containing 65 percent to 75
    percent available chlorine is needed per 100 gallons of water for at least a 100
    ppm chlorine residual. As an example, a well having a diameter of six inches,
    has a volume of about 1.5 gallons per foot. If the well has 200 feet of water,
    the minimum amount of hypochlorite required would be 9 ounces. (1.5
    gallons/foot x 200 feet = 300 gallons at 3 ounces per 100 gallons; 3 ounces x
    3 = 9 ounces.)]
    (B) The hypochlorite shall be placed in the well by one of the following or
    equivalent methods:
    (i) Granular hypochlorite may be dropped in the top of the well and
    allowed to settle to the bottom; or
    (ii) Hypochlorite solutions shall be placed in the bottom of the well by
    using a bailer or by pouring the solution through the drill rod, hose, or
    pipe placed in the bottom of the well. The solution shall be flushed
    out of the drill rod, hose, or pipe by using water or air.
    (C) The water in the well shall be agitated or circulated to ensure thorough
    dispersion of the chlorine.
    (D) The well casing, pump column and any other equipment above the water level
    in the well shall be rinsed with the chlorine solution as a part of the
    disinfecting process.
    (E) The chlorine solution shall stand in the well for a period of at least 24 hours.
    (F) The well shall be pumped until there is no detectable total chlorine residual in water pumped from the well before the well is placed in use
    24,000 gallon
    Vinyl Liner
    In Ground Pool
    Hayward super pump 1hp
    Hayward S220T 250lb. Sand Filter

  7. Back To Top    #7
    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, AZ
    Posts
    3,899

    Re: Testing very high chlorine levels > 50 ppm

    I don't see why it wouldn't work...yes, you'll lose accuracy if you dilute, but i think your estimate will be plenty precise for your purposes.

    How deep is your well, and do you know what kind of formation it's in?
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

  8. Back To Top    #8

    Join Date
    May 2012
    Location
    Greensboro NC
    Posts
    84

    Re: Testing very high chlorine levels > 50 ppm

    505'

    6" casing.

    Not sure what you mean by formation.
    24,000 gallon
    Vinyl Liner
    In Ground Pool
    Hayward super pump 1hp
    Hayward S220T 250lb. Sand Filter

  9. Back To Top    #9
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: Testing very high chlorine levels > 50 ppm

    He means what the aquifer is composed of. Is it sandy down there or perhaps the water is in a limestone or other rock type formation. Our aquifers here are sandy. Just out of curiosity, what made you have the well tested for coliforms? Was it you who pulled the sample?
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  10. Back To Top    #10

    Join Date
    May 2012
    Location
    Greensboro NC
    Posts
    84

    Re: Testing very high chlorine levels > 50 ppm

    Granite, I believe.

    I just so happen to go to church with a gentleman that works for a local municipality water department, and knew that he would run the tests for me. Water is clear, tastes great, smells fine, but I have small children and didn't get the well inspected when we purchased the house in April so I was curious. He gave me sample bottles, and I pulled the samples myself.

    1st sample, removed the screen from the kitchen sink and took the sample, tested positive for Fecal Coliform/ecoli
    2nd sample, emoved the screen from the kitchen sink, flamed the tap, and took the sample, tested positive for Fecal Coliform/ecoli
    24,000 gallon
    Vinyl Liner
    In Ground Pool
    Hayward super pump 1hp
    Hayward S220T 250lb. Sand Filter

  11. Back To Top    #11
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: Testing very high chlorine levels > 50 ppm

    I'm not saying you did anything wrong, but it is very easy to contaminate a sample. Sanitize your system and re-test is about all you can do. Go ahead and make sure you have enough reagent since you'll be using a lot. Good luck and let us know how it works out.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  12. Back To Top    #12
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: Testing very high chlorine levels > 50 ppm

    Here is a great guide for well disinfection put out by the State of Minnesota: http://www.health.state.mn.us/divs/e...sinfection.pdf
    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.

Posting Permissions

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