Our house is 25 yrs old and water supply comes from a drilled well. Water enters house and 3/4 " supply line is approx 3 feet to softener and the balance of house is 1/2 " copper pipe. Hot water heater is 30 ft from softener and lines serve the rest, another 40-50 ft, of the house (3 bathrooms, kitchen and laundry). What diameter lines should be used from softener to hot water tank and then on to balance of the outlets?