5 stage reverse osmosis process:

Stage 1
5 micron polypropylene sediment pre-filter to extract suspended materials such as sediments, asbestos fiber, rust, insects, and other particles down to 5 micron. (Replace every 6-8 months)* 
Stage 2 & 3
Double carbon block filters to absorb heavy chlorine and chlorine by products such as chloramines, THM, and dTCE.
The double carbon briquettes filter out organic matter from water without release of carbon fines.
The carbon block prepares water to enter the reverse osmosis element. (Replace once a year)* 
Stage 4
High rejection (95-99%) Thin Film Composite (TFC) RO membrane to reject a wide spectrum of impurities including Total Dissolved Solids (TDS), bacteria and viruses down to 0.0001 micron. The product water is stored in the water tank while the reject water is automatically flushed down the drain. 
Stage 5
In-line GAC filter is used to remove dissolved gases, bad taste and odor from product water. This is the final polishing stage before consumption. (Replace every 1-2 years)* 

*Depending on GPD consumed and quality of feed water

Home Purifying Systems
Pure Water Technologies #1 LLC

1-800-361-7889    www.arcticmountain.com