The AlkaViva Citric Acid Cleaning Filter for hard water scale removal.
 
This dual cartridge set has for each side of your Delphi H2, VestaH2, AthenaH2 or MelodyII water ionizer. One filter is blank and the cleaning filter uses SAFE citric acid to clean mineral residue from your water ionizer electrodes.
 
The AlkaViva H2 series of water ionizers have very efficient daily cleaning systems, so you can use this cleaning filter every other time you change your filters. Of course you'll do no harm by deep cleaning more often. We recommend annually.
 
EOS Scale Guard In-line filter available