Abstract: A small portable appliance for purifying potable water. A vertical "C" shaped body supports a purified water container on its lower horizontal leg. The rearward portion of the body's vertical back releasably carries a filtration cartridge defining three separate intercommunicating chambers replaceably carrying a pre-filter cartridge, an osmotic filter cartridge and a carbon post-filter cartridge. Control circuitry shuts off water input when the purified water container is full, senses and annunciates the amount of dissolved solids in effluent water and measures use time to annunciate estimated time for filter cartridge change. Internal structure provides storage for a removable connector tube.