We professionally make each kind of UDF filters, including 10" and 20" UDF filters and UDF BB.water filter,filtercartridge We professionally make each kind of UDF filters, including 10" and 20" UDF filters and UDF BB. The inside materials can be changed like active carbon and resin, etc.(water filter,filtercartridge,filter ) UDF Filter Cartridge(water filter,filtercartridge,filter )