This is an specialty filter which can be used in all AlkaBlue and older Jupiter, water ionizers. The Ultra BioStone uses hollow membrane technology. It also incorporates anti-microbial GAC, calcium and tourmaline.
Note: AlkaBlue .01M filters are not available right now in the US, but are interchangeable (and are identical, other than the label) with the Nexus .01M filters. Orders will be fullfilled with the .01M Ultra Nexus Biostone Filters.