I had a filter installed, and sand is not my problem. Local company says that it could be the sulfur eating the piston. I drilled five inch holes around the top of the aerator tank to let more of the gas escape, and I thought fixed things. It did not. Over the weekend I noticed a large wet spot in the yard, and found that the softener was just dumping water down the drain. Local company suggested putting a spray bar inside the aerator with a basket and chlorine tablet. When the tank fills, the water sprays over the tablet. Will this remove the sulfur? Also after my wife did a load of laundry there was a bunch of tan sand like material in the machine. I think it is resin from the softener. How does this happen, and does the softener need to be replaced? I do believe it is time to replace the control valve, I rebuilt it and it still does not cycle properly.