The JBL Replacement fine filter is extremely important adn should be cahnged every 5-12 months. The Fine filter prevents damage to main membrane from particles floating in water. The lifetime of the main membrane will be increased significantly.
JBL Replacement membrane for the JBL Osmosis 120. The membrane can be stored dry for 2 years. The lifetime of the membrane is 1-8 years depending on water quality (prefilter should be changed regularly !).