Residential customers get unmatched purity and taste from reverse osmosis water filtration systems. Cost effective and easy to maintain, water filters eliminate the expense of bottled water, without the recurring cost — and compromised taste — of chlorinating systems. PURA water filtration systems deliver exceptional flavor and health in every glass. Reverse osmosis works by forcing pure water molecules through a special membrane. This membrane is semi-permeable, meaning that it allows only certain materials through. The unfiltered water is pressurized, causing water molecules to diffuse (or travel) across the membrane, where the concentration of water is lower. Contaminants, particles, and other harmful materials cannot penetrate the membrane, leaving you with pure, delicious water for your family to enjoy. Not sure of the size of the system you need? Call our Customer Service Team at 1-800-942-7873.