FAS-DPD Test

[elsie]

Thanks so much Carl. Yes, it appears that R-872 is for bromine, the R-0003 for CL.

I see that all three numbers are listed multiple times with extra letters/numbers added, such as R-0003-A, R0003-A-24, R-0003-A144 etc. etc. When I drill down into each one I see it lists the same language, so I'm guessing that they are all the exact reagent, and that the different suffixes merely represent some type of cross-referencing.

There is one more thing you could help me with. I don't understand Step 1. of your instructions. It simply doesn't compute, i.e., what does it mean "For 1 drop = 0.2 ppm, use 25 mL sample. For 1 drop = 0.5 ppm, use 10 mL sample." I must not recall this from Ben's 2005 kit or we just didn't have the option. In any case, this will clearly become important because of the 'drop equivalence' in Step 4. Can you expound on for my brain block? Thanks again -

[GraceByDesign]

....
There is one more thing you could help me with. I don't understand Step 1. of your instructions. It simply doesn't compute, i.e., what does it mean "For 1 drop = 0.2 ppm, use 25 mL sample. For 1 drop = 0.5 ppm, use 10 mL sample." I must not recall this from Ben's 2005 kit or we just didn't have the option. In any case, this will clearly become important because of the 'drop equivalence' in Step 4. Can you expound on for my brain block? Thanks again -

If you use a 25ml sample, each drop you add in step 3 represents .2ppm FC (this is the 'drop equivanlece') so multiply # drops in step 3 by .2 to get ppm FC.
Same for step 7... for a 25 ml sample, drop equivalence is .2

If you use a 10ml sample, each drop represents .5ppm FC. This method requires fewer drops, but would also be slightly less accurate.

[CarlD]

I simply cut-and-pasted the directions directly from Taylor.

If you fill your sample tube to the 25 ml mark, each drop of titration fluid counts as .2 ppm. So you need 5 drops for each 1ppm.

If you fill to 10 ml, then each drop represents .5ppm and you need 2 drops for each 1ppm.

[elsie]

Ok you guyses, I get it. It's the same thing I do now. What threw me off was that the Taylor folk evidentally put this "note" smack underneath the first step, so my mind was trying to tie it in with that first step. Added to that was the word "multiply" when I use division for the FAS-DPD test. Of course, in this application, they are one and the same as long as you move the decimal point.

Thanks all for helping with this (and my cognitive deficit)! I truly appreciate it.

[Poconos]

Check this place too...good prices and the reagents I got a couple years ago were shipped directly from Taylor.
Al

http://www.spspools-spas.com/

[dawndenise]

I see that all three numbers are listed multiple times with extra letters/numbers added, such as R-0003-A, R0003-A-24, R-0003-A144 etc. etc. When I drill down into each one I see it lists the same language, so I'm guessing that they are all the exact reagent, and that the different suffixes merely represent some type of cross-referencing.

Chem Geek did us all a great service when he searched out all those codes. Look for his post in this thread...

http://www.poolforum.com/pf2/showthr...reagent+refill

Watch out for those "A144"s!!!!!

[ivyleager]

I ordered several reagent vials and DPD-FAS powder on Tuesday from Taylor Industries.....it arrived this morning. Quick shipping!

CaryB

[elsie]

Ah, that's what the codes are all about. All good information! Thanks again to everyone.

[webfeet]

I guess I am more than a little dense, but I have searched the site, and I don't know what test kit I need to buy to check free, total and combined chlorine. I apologize, it this the wrong thread, but please direct me to the right one. Thanks, Webfeet

[chem geek]

For a complete test kit that includes the FAS-DPD chlorine test for free and combined chlorine (the sum of free and combined is total chlorine), that's the Taylor K-2006 test kit. This will also test pH, Total Alkalinity (TA), Calcium Hardness (CH) and Cyanuric Acid (CYA). It also includes an acid/base demand test, though that's not particularly useful for small increments in pH.

If you only need the chlorine test kit because you have everything else, then you can get the Taylor K-1515-A which is a FAS-DPD chlorine test only (no tests for pH, TA, CH or CYA).

Richard