Aquasana 2-Stage Under Counter AQ-5200 Water Filter Superior filtration bringing you cleaner and healthier water than ever before Aquasana’s 2-stage under counter drinking water system in brushed nickel or polished chrome features the high-performing NSF-certified Claryum™ filtration, for healthy great-tasting water straight out of the tap. The AQ-5200 uses two distinct stages of selective filtration, which involves the process of sub-micron filtration, micron filtration, adsorption and ion exchange, to reduce 68 chemicals, heavy particulates and dangerous heavy metals ...