The Kraus - 2-Stage Carbon Block Under-Sink Water Filtration System with Digital Display is extremely economical. No more having to use water bottles. The installation process was easy. Step by step instructions, hardware, tubing adapters and batteries are included. The Kraus filtration requires a separate water outlet. We were in the process of remodeling our kitchen and replaced our faucet. We were able to use the part where the sprayer used to be for the filtration.