You can sign up for coverage ranging from one to three years, covering one, two, or three filters. For the best value, we recommend the longer coverage period. During the coverage period, if your filtration system needs repair, our maintenance agreement covers all costs of those repairs, including parts and labor, with no surprise expenses. It’s that simple! As long as you purchased the unit from Metro Water Filter of the South, had it properly installed by our technicians, and are servicing it at the recommended intervals, you’re covered.