Water Filter Types

Seven categories, very different trade-offs. The right filter depends on your contaminants, budget, and how much installation you want to deal with.

How we categorize filters: We group products by installation type and filtration technology, not brand marketing. "Reverse osmosis" includes both under-sink and countertop RO systems. "Whole-house" covers carbon, sediment, and specialty systems designed for point-of-entry installation. Product counts reflect filters in our verified database with active status.