As a user of TF kit FAS/DPD and needing some lead time to import it from USA ( Dave ), I been trying to figure out how long will a bottle of R-00871 last. The R-0870 podwer is not an issue. Shocking a pool will take lots of R-0871 anyway.
I can't get an exact figure because I do not know the surface tension, specif gravity and whatever the figure needed to calculate how many milliliters is a drop of reagent R-0871. As if I can calculate if I know those numbers..LOL
The common rule of thumb I got is 0.04ml (25 drops per 1 ml ) per drop or 20 drops per 1 ml. This is for water or common solvent from an eye dropper. I will use 20 drops per milliliter.
The R-00871 is 30 ml, that means 600 drops.
So based on 0.5 PPM test resolution and no CC, one test a day and no shocking.... this is what to expect :
1.5 PPM FC = 200 test 6.6 months
2.0 PPM FC = 150 test 5 months
2.5 PPM FC = 120 test 4 months
3.0 PPM FC = 100 test 3.3 months
3.5 PPM FC = 85 test 2.8 months
So for me, I will use two months as maximum because I do usually two test a day.
I am already about to deplet my R-0871 in only a bit over 2 weeks... ...oh Boy, I am "shocked" to have done so many "shocking" in such a "shocking-ly" short period of time... 
So those of you living outside USA, you can plan ahead.
I have now 2 more bottles of R-0871 and R-0870 powder ordered as spare, but only 1 of R-003 original to the complete test kit.
Just so that you guys know, how cheap our dear Dave ( Duraleigh ) is selling here is the calculation :
For US$ 23 you get ....
2 x 30ml R-0871 ( total 60ml )
1 x 22ml R-003
1 x 10 grams DPD powder
Taylor direct for the kit but much less R-0871 reagent at only 22 ml and they are US$24
Poolcenter.com is asking US$21.97 for Taylor kit.
The only extra thing you got from Taylor is the blue box. I don't need the box.
The way I see it, you will run out of R-0871 first, so a 22ml Taylor is so wasteful...but you get the box..
If I want to calculate $$ for $$, this is how I will calculate.
I get 60ml + 22 ml + 10 gram = US$23 from TF test kit
I get 22ml + 22ml + 10 gram = US$21.97 from Taylor/Poolcenter.com
So per unit of either milliliters or grams =
92 units for US$23 by TF kit
54 units for US$21.87 by Taylor/Poolcenter.com
Simply put, TF kit is almost half the price of Taylor kit or Taylor kit is almost double the TF kit.
If you shock a lot, Taylor kit can be 22/60ml = 2.7 times more expensive than a TF kit because I looked at Taylor website and they do not sell R-0871 individually. It must come as test kit....
So, thank you Dave ( Duraleigh )...you are not only a Speedy Gonzales on delivery, I also doubt selling the TF kit can do you any financial justice worth the time. If you can sell 500 kits a day...maybe I want to be you....
, otherwise I want to be your customer. 
I can't get an exact figure because I do not know the surface tension, specif gravity and whatever the figure needed to calculate how many milliliters is a drop of reagent R-0871. As if I can calculate if I know those numbers..LOL
The common rule of thumb I got is 0.04ml (25 drops per 1 ml ) per drop or 20 drops per 1 ml. This is for water or common solvent from an eye dropper. I will use 20 drops per milliliter.
The R-00871 is 30 ml, that means 600 drops.
So based on 0.5 PPM test resolution and no CC, one test a day and no shocking.... this is what to expect :
1.5 PPM FC = 200 test 6.6 months
2.0 PPM FC = 150 test 5 months
2.5 PPM FC = 120 test 4 months
3.0 PPM FC = 100 test 3.3 months
3.5 PPM FC = 85 test 2.8 months
So for me, I will use two months as maximum because I do usually two test a day.
I am already about to deplet my R-0871 in only a bit over 2 weeks...
...oh Boy, I am "shocked" to have done so many "shocking" in such a "shocking-ly" short period of time... So those of you living outside USA, you can plan ahead.
I have now 2 more bottles of R-0871 and R-0870 powder ordered as spare, but only 1 of R-003 original to the complete test kit.
Just so that you guys know, how cheap our dear Dave ( Duraleigh ) is selling here is the calculation :
For US$ 23 you get ....
2 x 30ml R-0871 ( total 60ml )
1 x 22ml R-003
1 x 10 grams DPD powder
Taylor direct for the kit but much less R-0871 reagent at only 22 ml and they are US$24
Poolcenter.com is asking US$21.97 for Taylor kit.
The only extra thing you got from Taylor is the blue box. I don't need the box.
The way I see it, you will run out of R-0871 first, so a 22ml Taylor is so wasteful...but you get the box..
If I want to calculate $$ for $$, this is how I will calculate.
I get 60ml + 22 ml + 10 gram = US$23 from TF test kit
I get 22ml + 22ml + 10 gram = US$21.97 from Taylor/Poolcenter.com
So per unit of either milliliters or grams =
92 units for US$23 by TF kit
54 units for US$21.87 by Taylor/Poolcenter.com
Simply put, TF kit is almost half the price of Taylor kit or Taylor kit is almost double the TF kit.
If you shock a lot, Taylor kit can be 22/60ml = 2.7 times more expensive than a TF kit because I looked at Taylor website and they do not sell R-0871 individually. It must come as test kit....
So, thank you Dave ( Duraleigh )...you are not only a Speedy Gonzales on delivery, I also doubt selling the TF kit can do you any financial justice worth the time. If you can sell 500 kits a day...maybe I want to be you....
, otherwise I want to be your customer. 
I will print it out and put it in my pool folder!
:grrrr:
