The answer to 'backflow preventer vs' is that a backflow preventer is a critical plumbing device that prevents contaminated water from flowing back into the clean water supply, while a water softener is a separate appliance that removes minerals from hard water to improve water quality. Backflow preventers are required by code in many areas to protect the public water system, while water softeners are optional but can provide benefits like reducing limescale buildup and improving the efficiency of appliances.
Backflow preventers are installed at the connection between the municipal water line and the home's plumbing system, while water softeners are typically installed near the main water line or at individual appliances. Backflow preventers have moving parts that must be tested regularly to ensure they are functioning properly, while water softeners require periodic maintenance like refilling the salt reservoir. The cost of a backflow preventer can range from $100 to $500 or more depending on the type and size, while a basic water softener system may cost $500 to $2,000 installed.