I gotta say you should consider a water softener for more than just your car. It is the first upgrade I make to my home if it doesn't have one. It helps extend the life of appliances and water heaters greatly in areas of hard water. It makes keeping the house clean so much easier, especially faucets, toilets and showers.
My parents have VERY hard water through their city and their water heater would die every 5 years like clockwork. They finally got a water softener and the newest water heater is on year #9 and no issues.
My parents have VERY hard water through their city and their water heater would die every 5 years like clockwork. They finally got a water softener and the newest water heater is on year #9 and no issues.