The Puretec WU-UV100 systems come with filtration and ultraviolet all-in-one unit with a reversible mounting frame.  These economical systems are designed for both mains and rainwater supplies, and effectively eliminate 99.9% of bacteria in your water including E. coli. They can be installed from left to right or right to left depending on the water supplies point of entry. Enjoy the peace of mind knowing you have safe, purified water at every outlet in the house.