... 4.used in greenhouse for hydroponics 6" HYDROPONIC INLINE EXHAUST AIR CARBON FILTER SCRUBBERConstructed with 52mm thick carbon layer, it can effectively eliminate odors ... filters and filtration equipment available, such as air filter, water filter, oil filter, carbon filter, acid filter, oil purifier, filter bag, bag filter, filter cartridge , filter equipments etc.Reason 4Shanghai Baosteel (world ...