12VAC5-635-250: Filtration

A. The owner shall ensure that harvested rainwater for Tier 2, Tier 3, and Tier 4 end uses is filtered.

B. Filtration is not required for Tier 2 end use water used outdoors.

C. If ultraviolet disinfection is used, particulate filtration systems shall be located downstream of the water storage tank and upstream of the ultraviolet system.

D. If ozone or chemical based disinfection is used, particulate filtration systems shall be installed downstream of the disinfection equipment. Filtration shall be installed as required for the disinfection system and in accordance with manufacturer's installation requirements.

E. Filters shall be sized to extend service time and shall be labeled to demonstrate compliance with NSF 42 for the reduction of taste or odor or shall be labeled to demonstrate compliance with NSF 53 for organic and cyst removal based on the end use tier.