A reverse osmosis (RO) system removes various contaminants from water through a multi-stage filtration process. To make water safe to drink, the water filtration system uses a thin membrane to remove salt, chemicals, and impurities. This thin membrane (a polymer film) with very small pores allows contaminated water to pass through. Minerals and microorganisms in the water are filtered out by the membrane. The contaminants are flushed away through an exit p...