Filter pack
Filter-purifier cartridge
Filter/demineralizer unit
Filtering apparatus
Filtration device
Filtration device for liquids
Filtration system
Fixed bed multiple zone fluid-solids contacting apparatus
Fluid treatment device
Fluidized bed apparatus
Fuel filter and dryer
Granular filtration device for water
Gravity water purifier
Gravity-flow water filtration device
Home water filter
Honey comb filter assembly and method of making the same
Individual portable water-treatment device
Insert for a water purifier
Intersecting water conducting filter
Intersecting water conducting filter