This may be more of a testing issue but I was hoping to get some input. I have used the salt drop test from TFKits for years now. It's always read within a few hundred ppm of my IC40 reading. Ever since having my new pool my IC has consistently read about 800 ppm less than my drop test. I bought a new refill at the beginning of the year so my reagents should be good. Today pentair sent out a rep to check out my cell. He used a digital meter and said that the IC is really close and my drop test is off. What are you guys using and what are your thoughts? Appreciate it.