Replacement Carbon Block Cartridge for AquaticLife Reverse Osmosis RO Filter.
STAGE 2 – TWIST-IN CARBON BLOCK FILTER CARTRIDGE. Premium quality Carbon Cartridges for the Twist-In Reverse Osmosis/Deionization Systems. Aquatic Life Twist-In Carbon Block Filter Cartridge: Recommend replacing every 6 months. Reduces chlorine and conditions water prior to a RO membrane.