Filter for Masterpiece, Technos, Regency 2 and AquaTonic Water Ionizers Replacement filter for the Jupiter Masterpiece & Technos Water Ionizers Also for the Regency 2 and AquaTonic Water Ionizer The .1 micron Bistone Filter - NOTE SEE DESCRIPTION Highly effective multi-layered filter with layers of silver activated carbon fiber Filter is 10" Tall x 3 1/4" Wide; The bottom opening is 1 1/2" Outer Diameter