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There are several different combinations of Filters available for the Double Stage Big Blue Systems.
Filter Set Option 1: 1 Micron, & Activated Carbon Block
Filter Set Option 2: 1 Micron, & Silver Nano Carbon
Filter Set Option 3: 1 Micron, & Premium KDF Cartridge
Filter Set Option 4: 1 Micron, & 0.1 Micron
Filter Set Option 5: 1 Micron, & Siliphos Cartridge
Filter Set Option 6: 5 Micron, & 1 Micron