I have had swg sytem for about 3 weeks now. I love it to say the least. I had not checked my salt in about a week. It had been staying around 2900, but tonight it was 2500. Why I dont know. I havent lost any water. have gained some cause of rain. I added approximately 16lbs of salt to get it to where it needs to be. Which brings me to my next question. How and the heck does everyone weigh there salt? i had a half a 40lb back so I put a little less than half a bag in it.