There is no question (yet) - - it's merely information intended for IC40 owners who may be thinking about trying to Field Calibrate thier unit. If your IC40 version is newer than V1.6, you can not field calibrate it (according to Pentair tech support).
I have a 6-month old Intellichlor IC40 (V2.01 built July 09) installed on my pool.
The LOW Salt light stays on and the Cell is off (no CL being produced). EasyTouch diagnosics show zero salt level.
Salt tests using new Aquacheck strips show salt level is 3840ppm. Took sample to Pool store test...
