... free chloride, organic matter, harmful matter and so on4. Micron filter--prevent any deposition of large Particles, some bacteria, and ... for drinking or beverage factory, which include sand filter, carbon filter, softener, micron filter and RO system.1.1 First stage pretreatment ... of backwashing valve. 1.4 Third stage pretreatment (Micron filter)Particle size in water to remove fine particles, sand ...