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The sediment pre-filter is used to prevent dirt and sediment particles from entering and clogging the main filter unit.
This cartridge should be replaced every 1-3 months depending on water quality ..
Replacement filters for the Aquasana Drinking Water Filter Systems
This replaces filters in the Countertop Filter (AQ-4000), and older Under Counter Systems (AQ-4500, AQ-4501, AQ-4600 and AQ-4601)...
One remineralizer replacement for the AQ-RO-3 OptimH2O Reverse Osmosis Drinking Water System.
Remineralizer should be replaced approximately every year based on water quality and usage for optimal mi..