The salt reading on my salt cell has been dropping for the last week or so. It was 3600 a week ago, 3500 2 days ago and 3400 today. I purchased a taylor k 1766 test kit to confirm the level and its giving me a result of 4000. I am using a speed stir, the correct sample size and very carefully counting drops. The transition from milky to red is distinct and happens between 2 drops as it should. I ran the test twice in fact and got the same results. I ran the diagnostic on the aqua plus, see picture, and it confirms 3400. The pool and swg cell are less than a year old. All my logs are available on Pool Math. Which result should I trust?