Citric Acid cleaning cartridge sets are used for removing hard water scale and calcium build-up in the H2 Series. How often you need to use the filters depends on the level of hardness.
Refer to your H2 Series manual for frequency of cleaning, a clean ionizer will produce the best quality alkaline water with improved H2 and ORP performance.
Only AlkaViva has the confidence to test their water filters using an independent US EPA-Certified lab to ensure you are drinking not only alkaline water but clean and purified water with the best contaminant removal available. See the results here.