I have a Pentair SWG and it has been given me readings of Low Salt (2750ppm) and on occasion will switch to really low salt (2400ppm) and the unit will turn off.
The unit is less than a year old and it has always given low readings, but since it was installed in the winter I figured the cold temps affected the reading. I had not really paid attention because the unit would still run, but now at times it will actually shut down because of the salt reading.
I have been using Aquacheck test strips and they always give me a reading of 3300-3500ppm. Also, I have taken 2 water samples to the local Leslies and those seem to match my readings ( although they use test strips too.)
Are the test strips reliable or is there a drop based test? Or could my SWG have problems?