APEC Alkaline Mineral Portable Countertop Reverse Osmosis Water Filter System PH+, Installation-Free, fits most STANDARD FAUCET (RO-CTOP-PH) Hooks up to most STANDARD FAUCET in minutes. Just plug and drink! Lightweight, installation-free system. Its NOT compatible with pull-out faucets, special size designer faucets and sprayer faucets. Highest grade 4-Stage ultra-pure system with US Made food-grade calcium from trusted source Enjoy ultra-pure drinking water with added calcium minerals for improved alkalinity and great taste 90 GPD portable system built with high capacity filters for reliable, long lasting performance Perfect for apartments, condos, motor homes, retirement homes, seniors, students & travelers