What can cause the reading on the system to rise. We got the system at the start of this season. Had to have the first one replaced after 2 months because something shorted in it. This one has been in place since the first of July. It stayed at 3200 ppm readout almost the entire time we have had it. I have added no salt. Two days ago the reading shot up to 3400 ppm and today it is up to 3600 ppm without my adding any salt. They told me to keep it between 2700 to 3400. It is producing chlorine though.

Free Chlorine 2
PH 7.6
Alkalinity 100