Waterlink ® ROKIT Compatible Replacement Water Filters & Reverse Osmosis RO Membranes
It is a very common replacement order to use the 10/2 as the pre filter and the +5 as the post filter. If you desire 5 micron pre filtration, use the +5 for both the pre and post filters. Pre filters should be changed at least every 6 months and post filters changed at least every 12 months. So order twice as many pre filters as post filters. Membranes typically last 3 to 5 years. Water conditions will make this vary. To test your membrane use a TDS Tester.