Opened the pool last Friday, and did not turn on the SWG. It was showing 2900 ppm which I assume is from last year. Reset it and it showed 1200 ppm. Anyhow, water temperature is 52 F, so I vacuumed the pool for a couple days and then added 1.5 bags of salt, reset the aqualine again, and the instant test stopped around 2700ppm and then just went to 0 after about three seconds. It now constantly reads 0. Once this happened I simply put the switch back to the off position. I have flicked to auto a couple times, but no change.