I have purchased the TF-100 test kit a few seasons ago. I pretty much have run out of the R-0013 reagent. On website www.tftestkits.net I see I can buy a replacement bottle. On Amazon, I see a similar R-0013-E reagent made by Taylor Technologies. Is the R-0013 reagent for test kit TF-100 the same as the R-0013 reagent for the Taylor test kits?