Please note, this countertop RO system filters up to 0.5 - 1 gallon of water an hour; for a higher production rate, consider our under-sink RO systems; the countertop RO only works with faucets that use a threaded removable aerator; not compatible with sprayer faucets. Easy to Install Countertop Filter: Express Water’s countertop reverse osmosis systems only requires minutes to install and is designed for an easy 4-point installation that fits most standard faucet types. Low Maintenance Water Filter: Once set-up, the reverse osmosis countertop filter requires little maintenance. Quick-connect and replaceable water filter cartridges make it easy to keep your water fresh. 4 Stage Water Filters: Express Water 4 Stage Countertop Water Filter Systems include Sediment filter, Granular Carbon filter, Reverser Osmosis Membrane, and Post Activated Carbon filter to remove 99.99% of major contaminants in your drinking water. Countertop RO Water Filter System: Enjoy fresh and clean drinking water from the easy install Express Water countertop water filters. On Demand Support: Support from top rated customer service team who can answer any of your questions about your Express Water countertop filtration system. Backed by 1-Year limited warranty.