I test with both Taylor K2006 and Lamotte ph pocket tester and sometimes get numbers between the larger numbers on the iPhone pool calculator. For example, today I got 275 on CH which is between 270-280. I was not sure to base my calculation for increasing CH from either the 270 or 280 when raising to 300. The ph tester sometimes will give a figure of 7.45. Is this either 7.4 or 7.5. Maybe I am getting too worked up over these figures. I just figure that if I have spent so much money to test my pool that I might as well get it as close as possible.
This is not related to the original post, but does absorbic acid get rid of scale? Thanks!!!