22.32.00 Domestic Water Filtration Equipment
22.32.26.19 Domestic-Water Greensand Filters
22.32.13 Domestic-Water Bag-Type Filters 22.32.16 Domestic-Water Freestanding Cartridge Filters 22.32.19 Domestic-Water Off-Floor Cartridge Filters 22.32.23 Domestic-Water Carbon Filters 22.32.26 Domestic-Water Sand Filters 22.32.26.13 Domestic-Water Circulating Sand Filters 22.32.26.16 Domestic-Water Multimedia Sand Filters 22.32.26.19 Domestic-Water Greensand Filters