My SWG has a digital display that shows the level of salt, and I always go by that because if it goes low my system doesn't generate chlorine! If it gets down to about 2600 I add a 40 lb bag of salt. I had my water tested at Leslie's and they told me I had WAY more salt than my digital readout said, making me wonder if my digital display is incorrect. They have a whole new system this year to check chemicals and salt now. It does seem like I have had to add more salt in the last year than I have had to in the past. My salt cell is clean. It seems like I don't have any other choice than to trust my SWG digital display since that is what determines if chlorine is produced or not but is there another good way to test the salt level? I don't trust Leslie's, unfortunately.