The D&D Replacement 10" Carbon Block Filter is designed exclusively for the Reverse Osmosis units.
Carbon is renowned for its taint, odour and residue removal properties, therefore it's superb as part of a RO unit as it will remove chlorine and any other contaminants. It works alongside the Sediment Cartridge which can also be replaced.
To use, simply remove the spent cartridge and replace with the new unit.
It is recommended that the cartridge is replaced every six months for the best performance.