The fluoride-removal-filter for H2-Series water ionizers will remove more fluoride from your water than with just the ionizer itself or the UltraWater filter. This filter goes on the right side of your H2 Series ionizer. It's rated for 500 gallons.
Note: The AlkaViva water experts state that the Fluoride Shield filter is not for sediment and a separate sediment filter may be required to prevent clogging of the very fine Ultrawater filters. If you have a water sediment problem you are probably better off getting the external Fluoride Shield and then inside the ionizer use the standard UltraWater filter set (which has a sediment filter as part of the set).