Set of 3 internal replacement filters for municipal water with fluoride:
 
ONE ULTRA filter (good for 1,000 gallons) plus TWO fluoride filters (each good for 500 gallons)
 
These filters are for Alka Viva H2 water ionizers only - Delphi H2, Vesta H2, Athena H2 or Melody II
 
Standard Municipal/City Water filters available
Well Water filters available
EOS Scale Guard In-line filter available
 
Citric Acid Cleaning Filters available for annual maintenance.
Clean BEFORE you replace filters.
Good idea to do this every year or at least every 2 years.