Hi, I am going to be installing a water softner in my home, I have a 1" supply line that feeds the house and reduces down for each room supplied. Should I stay with 1" to feed the water softner? I know I need a bypass before the softner. What size expansion tank would be required for a home of 1800 sq ft? Do I need to the tank before or after the water softner and is a bypass reccommened before the tank?