I bought Ben Powell's PS-234 test kit back in July 2006 and have had great luck using it. I had to purchase additional DPD powder and R-0871 FAS-DPD reagent from Taylor in May 2007 since my high CYA pool requires a lot of reagent.
I'm almost out of the R-0871 FAS-DPD reagent again, although I probably have half of a vial of the DPD powder left. Would you recommend buying just the R-0871 reagent and powder from you at this point, or would you recommend that it is time to replace the entire PS-234 kit at this time? I have lots of reagents for all of the tests except the CYA test reagent is almost gone. I wasn't sure how long the reagents in the PS-234 kit could reasonably be expected to last?
Also, I was curious as to the automated industrial machine that is at the heart of TF Test Kits? :P I envision you and your family sitting around the table carefully filling the little chemical vials for the TF Test Kit from large gallon size jugs of reagent? Or is it more sophisticated than this?
I'm not sure when you went "live" with TF Test Kits actually shiping, but it would be interesting to get a rough idea of how many you have shipped.
Also, it would be interesting to hear the story of how you decided to jump into this business venture, what things were easier than you thought they would be and what things were harder than yo thought they would be, and any interesting stories or anecdotes since you started TF Test Kits.
Thanks for your help. And thanks for stepping into the void created when the PS-234 test kit no longer became available. All of us here at TFP really appreciate your efforts.