Stage 1 -20 Micron Pleated Sediment Cartridge (Part Number: 13040) Removes sand, silt, rust and other suspended sediment while protecting downstream filters and extending their service life. Stage 2 - 5 Micron Silver Impregnated Carbon Cartridge (Part Number: 13223) Reduces chlorine, taste, odour and fine sediment while the silver-impregnated media helps inhibit bacterial growth within the filter. Stage 3 - UV Sterilisation (Part Number: UV11066) UV11066 lifespan of 9,000 hours or 12 months.