Riggs Eckelberry, founder and CEO of OriginClear, a clean water innovation hub, says three types of under-sink water filter systems are commonly used. "Typically, you'll see single-stage filtration systems, which essentially utilize one method of filtration, and multistage filtration systems, which are filters with multiple levels or types of filtration," he explains. "There's also reverse osmosis filtration systems, which is a specific type of physical filtration wherein even very tiny particles are physically removed."
If you're not sure where to start, it turns out you can do this easily online. "I always recommend checking out the Environmental Working Group's Tap Water Database first to see what type of contamination you're dealing with in your ZIP code," Eckleberry echoes.