If you have recently ordered our annual 5 pack of replacement filters you may be wondering why there was no blue Stage 3 Membrane Filter included. Your first year of filter changes a Stage 3 Membrane Filter would not need to be changed since Stage 3 Membrane Filters are typically changed every 2-5 years. The annual 5 Pack of 4-Stage Reverse Osmosis System Replacement Filters includes two Stage 1 Sediment Filters, 2 Stage 2 Pre-Carbon Filters, and one Stage 4 Post-Carbon Filter.
Please refer to our Filter Maintenance Schedule for filter replacement recommendations.