... 2.5 stages with tank 3.10" length spun polypropylene removing dirt, rust and sand particles. RO system water purifier: (5 ... stages) GPD=gallon per dayStage 1: 10”, 5 micron PP meltblown Sediment ... organic contaminants, such as chlorine. taste reduction, odor reductionStage 3: 10”, CTO, carbon block filter cartridge that remove cholorine, taste, ...