Greetings everyone. I just joined TFP and would appreciate your advice on pool testing. I bought a Taylor K-2006 test kit and performed all the recommended pool chemical tests several days in a row. I also took the same water sample I used for my tests to the local Leslie's Pool store and had them perform their test. The greatest difference between my Taylor test results and the Leslie's test results was in the alkalinity readings. My readings were 140 ppm, 160 ppm, and 150 ppm total alkalinity. The Leslie's test results were 75 from one store and 76 from another store. If my readings are correct, then I need to lower alkalinity, but if Leslie's are correct, then I need to raise it. You can see my conundrum. I am known to be a perfectionist and followed the testing videos on the Taylor website exactly, so I have some level of confidence in the readings I took given the good reputation of the Taylor test kit. Any advice? Thank you.