Start by asking two questions. First: Are you on city water or well water? Second: What’s your budget—just the unit, or installation too? For city water, go with the Aquasana or iSpring. For well water, SpringWell or a dedicated iron filter. Do not buy a system from a random door-to-door salesperson; I did that once and ended up with a plastic tank that leaked on my new floor. Let’s just say I learned a lesson.
WHOLE HOUSE WATER FILTERS - Express Drainage Solutions
Also, check your flow rate. Most systems can handle 10–15 gallons per minute (GPM). If you’ve got a big family running two showers and a dishwasher at the same time, make sure you pick one rated for at least 12 GPM. Otherwise, you’ll be the person yelling, “Who’s using the water?!”