I just bought a house with an older water softner. The water softner is set to clean itself out every other day. How long should this take? Currently it takes about 3 hours. Also, it is being flushed into the sump pump which then runs about every 5 minutes for those 3 hours. This is very annoying at 2:00 in the morning and it kills the grass outside. I have a laundry drain (for the washing machine) right next to it, can I dump it into there instead so that it goes out through my septic system? Will it kill the grass over the leach fields? What other options are there?