Custom RO ET 5000/6000 5 Stage Replacement Filter Pack Made specificaly for the Envirotec(R) ET5000 and ET6000 5 stage reverse osmosis systems. Includes a 1 micron sediment pre-filter, a .5 micron carbon pre-filter, an ECT carbon post-filter, and a 5 micron GAC post filter. Replacement canister o-rings. (Does not include the replacment UV lamp) Keep your RO system at peak performance with quality replacment filters! Includes the new service manual "How to Service Your Reverse Osmosis System" by Dionicio Porras. Service your RO system like a pro!