The Aqua Flo Platinum Quick Change Reverse Osmosis system (QCRO) can be customized to meet your specific water requirements. Ten interchangeable filters offer a variety of treatment options that can be tailored to local water conditions so your water is always the best it can be. With the innovative, quick-change “twist and lock” filter casing design, you can simply twist off the old cartridge and twist on the new one. No messy sump removal.