Our Aqua Pure Flow QC (Quick Change) RO system is becoming very popular nowadays. The reason is because this system is very innovative and makes maintenance and filter changes very simple and easy. Every filter in this system is totally encapsulated. In order to change these filters, the filter is lifted to a 45 degree angle. This will immediately shut-off the system. The filters are then twisted ¼ turn counter clockwise to release. The new filter is then twisted clockwise and locked into place. These filter changes are so quick and easy that a complete filter replacement of all four filters can be done in less than five minutes! No wrench, tools, stress, or mess are necessary for this filter change. This unit is also more efficient than most reverse osmosis systems today.