The water filters for the Pure Q Reverse Osmosis system should be changed every 12 months.
Included in the Pure-Q Water Filter Set pack:
A 5 micron sediment cartridge
A 10 Micron Carbon Block
A GAC Filter
An Inline Post Carbon
These are the genuine original factory replacements. Highest quality with the best performance. Membrane is not included in this set, you change membrane every 3 years