Designed to flow 8.5 gallons per hour of pure RO water, with an astounding 2:1 ratioHigh flow rates and water savings never before seen in a package so affordable and durable. Utilizing the most efficient membrane technology in the world, built with dual o-ring fittings, and equipped with a steel pressure gauge. For those who demand even more performance, the EX200HF can be used with a booster pump, raising the system pressure to 80psi, increasing the gallon per day output.