These catchment systems from Rainbank can be found on Lopez Island in Washington State. Average annual rainfall for the area is 22 inches; water collected is for potable use. Storage capacity of these systems ranges from 15,000-20,000 gallons, and the system uses Pura Filtration, including UV for disinfection. Grunfos pumps are used for delivery to the cistern from the sump, as well as from the cistern to the house. For more information, visitRainbank.