This RO replacement kit contains the following filters:

• Stage 1 – 5 micron polypropylene sediment pre-filter to extract suspended materials such as sediment, rust, insects, and other particles down to 5 micron. (Replace every 6-8 months)

• Stage 2 - 5 Micron NSF-Certified Activated Carbon Block - High purity coconut shell activated carbon block filter reduces sediments, taste, odor, color, SOCs(soluble organic compounds) like pesticides, dioxins, and VOCs (volatile organic compounds) like chloroform and petrochemicals.

• Stage 3 -High quality NSF-Certified Reverse Osmosis Membrane: Removes 96% to 99% contaminants that might be present in water.  These can include lead, copper, barium, chromium, mercury, sodium, cadmium, fluoride, nitrite, selenium and bacteria

• Stage 4 – In line NSF-Certified GAC filter removes dissolved gases, bad taste and odor from product water. This is the final polishing stage before consumption. (Replace every 1-2 years)

Age of the filters depends on GPD consumed and quality of feed water.