APEC WATER SYSTEMS 5 Stage 50 GPD Reverse Osmosis Water Filter System ROES-50. The item "APEC WATER SYSTEMS 5 Stage 50 GPD Reverse Osmosis Water Filter System ROES-50" is in sale since Friday, June 5, 2020. This item is in the category "Home & Garden\Kitchen, Dining & Bar\Small Kitchen Appliances\Water Purification\Water Filters". The seller is "ruthie5252" and is located in Richmond Hill, New York. This item can be shipped worldwide.