I just purchased an Intex Sand Pump/Filter and an Intex Saltwater system. I have them running to a 22ft Ultra Frame (10k gallon) pool. I've followed the set up instructions very carefully and have been running the two for less than a week. The first problem I noticed is the amount of sand in the pool. I've backwashed, rinsed several times but the pump still pumps sand in the pool (although less than in the beginning). The second problem is the "low salt" light on the salt system came on and it switches to sleep mode. I tested the water which came back at 2800 ppm. I added 40 lbs of salt which brought it up close to 3000 ppm. Every time we try to run the system (I've turned it off and unplugged it to try to reset it), it runs for a short period of time and then displays the low salt error even though I know the pools salt level is good. I haven't cleaned the electrodes (which does have white scale) because I've only had it a week and I've heard cleaning it is hard on the components. Any suggestions?