90 GPD specially treated and batch tested high rejection rate RO membrane, 1 micron absolute rated sediment filter, 1 micron 12,000 gallon carbon block, custom blended ree fspecific DI resin that lasts up to 3x longer than normal mixed bed resins, a capillary tube flow restrictor you yourself adjust according to your own water conditions and an inline pressure gauge. They don't come any better or for any less money and backed by a company in the RO business since 1985 in Tempe AZ. No ebay overseas vendors and a real live person you can talk to with your questions. There really is a difference.
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