I purchased this Reverse Osmosis water filter over two years ago. I am impressed by the high quality of the entire filter mechanism, the smooth & great tasting water it produces, as well as the simplicity of the system. Tech support is far beyond my expectations. Don & John have provided patient and effective help, also making sure I have what I need to solve any issue. Today the water quality tested at 3, the same as RO distilled water I've tested. Highly recommend!