Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 8 of 8

Thread: Alternate testing formulas to use less reagents?

  1. Back To Top    #1
    JamieP's Avatar
    Join Date
    May 2011
    Location
    Waxahachie, TX (south of Dallas)
    Posts
    1,135

    Alternate testing formulas to use less reagents?

    It has been brought to my attention through my bicarbonate startup thread that some tests can be adjusted to use less reagents. Is there a place to find a summary of these, or perhaps by listing the alternate methods for each test here, it would help others too. I don't know if there are times when using the full sample amount vs the lesser sample size is more appropriate, so if this matters, please include that too.

    Thanks!
    28,000 gallon freeform, Stonescapes Tropics Blue Minipebble with abalone, 3.5' to 8.5' depth. 2 skimmers, 5 returns, dedicated vacuum port, Dolphin Z5 robot. All Pentair equip: EasyTouch 8, IC60 SWG, VS pump, 520 Cartridge Filter, 3 Intellibrites, 2 Color Cascade Bubblers. TurboTwister Slide and 8' Salt System Jump Board. TF-100. My Jan-Mar 2016 build:
    Waxahachie, TX Owner Build - A race to beat the baby!!

  2. Back To Top    #2
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,955

    Re: Alternate testing formulas to use less reagents?

    The Extended Test Kit Directions gives a few. Make sure you look down in the "notes".

    Here's just one example (FC):
    FC REAGENT VARIATIONS
    5ml sample, multiply drop count by 1 (used to save on reagent; not as precise)
    10ml sample, multiply drop count by .5 (standard method)
    25ml sample, multiply drop count by .2 (used for extreme precision)

    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  3. Back To Top    #3
    JamieP's Avatar
    Join Date
    May 2011
    Location
    Waxahachie, TX (south of Dallas)
    Posts
    1,135

    Re: Alternate testing formulas to use less reagents?

    Quote Originally Posted by Texas Splash View Post
    The Extended Test Kit Directions gives a few. Make sure you look down in the "notes".

    Here's just one example (FC):
    FC REAGENT VARIATIONS
    5ml sample, multiply drop count by 1 (used to save on reagent; not as precise)
    10ml sample, multiply drop count by .5 (standard method)
    25ml sample, multiply drop count by .2 (used for extreme precision)

    Thanks! I thought maybe I was just missing something. I'll have to write all of these down.
    28,000 gallon freeform, Stonescapes Tropics Blue Minipebble with abalone, 3.5' to 8.5' depth. 2 skimmers, 5 returns, dedicated vacuum port, Dolphin Z5 robot. All Pentair equip: EasyTouch 8, IC60 SWG, VS pump, 520 Cartridge Filter, 3 Intellibrites, 2 Color Cascade Bubblers. TurboTwister Slide and 8' Salt System Jump Board. TF-100. My Jan-Mar 2016 build:
    Waxahachie, TX Owner Build - A race to beat the baby!!

  4. Back To Top    #4

    Join Date
    Jan 2015
    Location
    Tampa Bay, FL
    Posts
    16

    Re: Alternate testing formulas to use less reagents?

    With the CYA test in the TF-100 test kit it helps to save on reagent if you know your result to be 50 ppm or above and reduce your sample and reagent amounts accordingly (and proportionally).

    For instance, 15 ml will fill the test tube just above the 50 ppm mark, so you need 7.5 ml of pool water and 7.5 ml of R-0013 reagent, which is about half of the amounts used compared to the test kit instructions. I use an oral syringe from Walmart (True Easy Syringe) and a bottle adapter to draw the right amount of reagent directly from the 8 oz. bottle of R-0013 that comes in the test kit, and another syringe (to avoid contamination) to draw pool water.

    The True Easy Syringe has the added advantage that it uses "lockable" amount settings of 2.5, 5, 7.5 and 10 ml. So, once I dial-in the desired amount, I just draw the plunger until it stops at the preset setting and I only have to worry about getting rid of air bubbles. It's an extremely convenient, quick and accurate way of drawing the right amount of reagent or pool water.

    The bottle adapter allows for sticking the syringe into the reagent bottle, inverting both bottle and syringe without spilling anything and drawing the reagent into the syringe.

    So, if your CYA level is 50 ppm or above you can double the number of tests the TF-100 kit provides using the above method.
    17,700 gal fiberglass outdoor, rectangular, chlorine-sanitized in-ground pool, 35x15 ft2. Pentair FNS Plus D.E. Filter (48 ft2). Pentair Whisper Flo 4 (1 hp) pump. Two skimmers (@2- and @4-), two returns (@7- and @10-), one vacuum (@4-o'clock position skimmer), no main drain. Autofill device adding ~1000? gal of utility water per week. TF-100 test with speed stir.

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

    Re: Alternate testing formulas to use less reagents?

    Just for good measure Jamie, you always give up some accuracy when you dilute, or use smaller samples. One half dilution of the Cya test isn't so bad, but when you consider how infrequently you'll run it....well....it's not saving that much money in the long run. When things are normal again, it's best to go back to full sample sizes for the best numbers. On the FC TEST, it's with a lot of experince from my work that it's the worst test to skimp on. Unless the FC is extremely high, it's really not worth using the smallest sample size.
    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
    JamieP's Avatar
    Join Date
    May 2011
    Location
    Waxahachie, TX (south of Dallas)
    Posts
    1,135

    Re: Alternate testing formulas to use less reagents?

    Quote Originally Posted by Patrick_B View Post
    Just for good measure Jamie, you always give up some accuracy when you dilute, or use smaller samples. One half dilution of the Cya test isn't so bad, but when you consider how infrequently you'll run it....well....it's not saving that much money in the long run. When things are normal again, it's best to go back to full sample sizes for the best numbers. On the FC TEST, it's with a lot of experince from my work that it's the worst test to skimp on. Unless the FC is extremely high, it's really not worth using the smallest sample size.
    Thanks Patrick. This is good to know. This mostly came up because initially I was blowing through the TA reagents with the Bicarbonate startup because I didn't know you could use a 10 ml sample instead of the 25 ml sample, and we were testing every 2 hours! Brian got me straightened out on that though, and helped improve my accuracy!
    28,000 gallon freeform, Stonescapes Tropics Blue Minipebble with abalone, 3.5' to 8.5' depth. 2 skimmers, 5 returns, dedicated vacuum port, Dolphin Z5 robot. All Pentair equip: EasyTouch 8, IC60 SWG, VS pump, 520 Cartridge Filter, 3 Intellibrites, 2 Color Cascade Bubblers. TurboTwister Slide and 8' Salt System Jump Board. TF-100. My Jan-Mar 2016 build:
    Waxahachie, TX Owner Build - A race to beat the baby!!

  7. Back To Top    #7
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: Alternate testing formulas to use less reagents?

    I've seen your thread here and there, but just enough to know how much help he's been to you. Good guy that Brian.
    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

  8. Back To Top    #8
    JamieP's Avatar
    Join Date
    May 2011
    Location
    Waxahachie, TX (south of Dallas)
    Posts
    1,135

    Re: Alternate testing formulas to use less reagents?

    Quote Originally Posted by Patrick_B View Post
    I've seen your thread here and there, but just enough to know how much help he's been to you. Good guy that Brian.
    I can't agree enough about Brian! He's the epitome of the kind of generous and selfless help TFP prides itself on. I am very grateful for his, and everyone else's guidance.
    28,000 gallon freeform, Stonescapes Tropics Blue Minipebble with abalone, 3.5' to 8.5' depth. 2 skimmers, 5 returns, dedicated vacuum port, Dolphin Z5 robot. All Pentair equip: EasyTouch 8, IC60 SWG, VS pump, 520 Cartridge Filter, 3 Intellibrites, 2 Color Cascade Bubblers. TurboTwister Slide and 8' Salt System Jump Board. TF-100. My Jan-Mar 2016 build:
    Waxahachie, TX Owner Build - A race to beat the baby!!

Posting Permissions

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