Purchased new reagents from @TFTestkits , started using them today. Came up with 4ppm difference on free chlorine so wow. Couldn't believe that I gained that much in one day so I retested again same result. Decided after looking at the drops that they seemed smaller than the other bottle so I poured new reagent in old bottle and got 4ppm less than originally tested. Ive been following this sight this summer and I know to wipe the tip between drops and squeeze a little air out to try to make the drops uniform and I did all that. These two droppers just put out different drops and that s really all there is to it. I realize nothing is exactly perfect but I shouldn't be getting this large a difference from another dropper and the worst part is that I do not know which dropper is giving me the correct reading if at all. If I can get this large a margin of error with a new bottle then I almost have to assume that the rest of the kit is suspect as well. Don't get me wrong, I don't want to be down on the kit, I have taken care of my pool for the first time this summer according to methods and advice that I received here and my water looks great, . but is my CSI correct? maybe my swg keeps spitting out flakes because my test results are actually off by 30% due to drop size from bad dropper tips ? How can I trust a chlorine test that off by %50 just because I purchased new reagents. Very disappointed this morning . Picture has old one on the left (came with kit) new one on the right
