I just got in a ColorQ test kit by LaMotte. I have the tf-100 test kit, but really have trouble with the Ph readings. I did a comparison test of the two kits twice now, one yesterday afternoon and one this morning. The only two readings that are the same are the Ph and alkalinity. The chlorine reads on the lamotte reads a little lower than the tf-100 in both testings. the CH was off everywhere. Yesterday afternoon my tf-100 kit read 300 and this morning its 220. I don't know how they are both so different. Yesterday afternoon the colorQ CH was 274 and this morning its 302. The color Q testing for CH is closer this morning with yesterday. Its my CYA that I'm more concerned about than anything. the tf-100 is consistently giving me readings of 60-70. The colorQ has now given me two readings of 95 yesterday afternoon and 91 this morning. My pool water temp was 89 degrees yesterday and its 85 degrees this morning. Not too much difference in temps. I have seen a tutorial on how to judge how much solution in the vial to where I don't seen the black dot. I can't find it. I have tried to search. Please someone give me a link to that so that I can make sure that I'm doing the tf-100 CYA test correctly. With the colorQ, i did not touch the tablet. I put the foil pack over the vial and pressed so that the tablet fell directly into the vial. I followed the instructions exactly. I have got to find out which test is correct. CYA results of 60 are alot different from results of 90. I can't figure out how much I need to chlorinate my pool. I have stopped using my chlorine feeder and am totally using the BBB method now. Any help here is appreciated. Thanks.