I am trying to figure out if I have an issue with my salt sensor. My Jandy Aquapure is reading the salinity to be 2700 whereas the Aquacheck test strips indicate that my salt is around 3800. I cleaned the cell yesterday with the diluted MA and I did not see any fizzing that would indicate a calcium buildup. I am reluctant to use the local pool stores as their results seem to vary from the TF-100's results for items such as TA and PH. The Jandy website indicates that there may be a margin of error on test strips of up to 800. A margin of error of 800 could also mean that the salt level is actually 4400. At this point I am not certain if I should add salt or get water tested at a couple of pool stores and see if their reading is close to either the sensor or the test strips and assume that one or the other is correct. I believe that optimum for the salt cell on the Jandy is 3000 to 3500.