Annual 5 Filter Set for 5-stage Alkaline MyWaterClub Countertop RO Systems, including Sediment, T28, 100 GPD RO membrane, T33 & 3-in-1 Alkaline inline filter cartridges 5 Filter Set for 5-stage Alkaline MyWaterClub Countertop RO Systems, including Sediment, T28, RO membrane, T33, and 3-in-1 Alkaline inline filters. Set includes 5 filters: 1st stage: Premium Quick-Connect 5 micron sediment filter. Dust and rust particles are trapped here in a filter which also extends the life of the system and the membrane. 2nd stage: Premium USA-made Quick-Connect T28 coconut-activated carbon filter 3rd stage: Reverse Osmosis Membrane, 100 GPD membrane 4th stage: Premium Quick-Connect T33 coconut shell activated carbon filter. 5th stage: Premium 3in1 Alkaline post filter. Increase pH level to 8-9.5. Content 4 media: alkaline, ORP, Tourmaline & Calcite media. The filter is filled with multifunctional mineral balls. ORP ceramic balls are made of natural nonmetal mineral tourmaline, high-grade clay added with other natural healthcare powders, such as negative ion powder, germanium powder, etc. Also, this filter reduces water Oxidant Reduction Potential to -50mv~-150mv. Memrbane Housing wrench included