... +RO+T331st Stage: PP Sediment FilterFunctions: Removing sand, rust, mud, sediment in water 2nd Stage: Granular Active ... Carbon FiltrationFunctions: Removing bad smell & filtering organic sediment3rd Stage: Block Active Carbon Filtration4th Stage: ... Removing germ, virus, corposcule, other solute & chemicals5th Stage: In-line Post active Carbon FiltrationzFunction: Adjusting & ...