I am working on getting my mother-in-law's pool going this year. I wasn't covered last fall so I am working with nasty conditions. I had my water tested today and my salt is 3900 ppm (manufacturer suggests 4000). Earlier today I was able to put the generator on super chlorinate but after I back washed my filter this evening it would not go back to super chlorinate setting. I also cannot adjust the output levels. Does anyone have some suggestions for me?