Direct replacement for GRO reverse osmosis systems including Ultima Water Systems GRO50-4, GRO50-5, and GRO50-ALK. Works with most GRO (Green RO Systems) brand of RO systems.
This direct replacement GRO membrane kit includes replacement GRO membrane and properly sized flow restrictor, and service manual “How to Service Your Reverse Osmosis System” by Dionicio Porras.
This kit will not upgrade a standard RO to a Green RO.
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