Description : 2231431429_6416909893 The carbon block cartridge on the Pinnacle RO helps prevent your membrane from clogging and removes smells and discolorations. Replace as needed to ensure maximum efficiency. Replace at the same time the sediment filter is changed (located in the middle of the filter system on the Pinnacle + models). All listed service times are approximate. Actual service life may be longer or shorter depending on the water source quality. Click here for the Pinnacle Manual from the manufacturer (PDF viewer required).