Douplex filter applied to remove invisible solid impurities in the milk, sugar, beverages, oral liquid. IntroductionDuplex filters is made of all high-quality SUS304 stainless steel which is composed of two cylinders, both inside and outside polished 0.4um, the top fitted with pressure gauge, exhaust valve. Douplex filter applied to remove invisible solid impurities in the milk, sugar, beverages, ...