I am in the process of readjusting my salt level. It has dropped due to refilling for a leak (fixed) and overflow from heavy rains lately. The swcg before all of this stayed around 3000-3200 and worked great. The display showed low salt (-2500) and check cell, which I did and it looked great. So I put in a 40# bag figuring it would at least come up to 2700 and get rid of the warning lights, and it did for about a day and now its back down to 2600 and the lights are back on. I checked it with the salt test strips and it showed about 3800, but those have always read much higher than the display on the swcg. Any ideas on things I should check or test would be great. The pool is 15,000 gallon. Also what level is it best to keep it at? On the low side (2700) or the high side (3400)?