If you are on a city water then it makes great sense use the Biostone Plus water ionizer filter! Optimal performance includes a special heavy metal reduction media that effectively reduces lead, aluminum, copper and other heavy metals. The addition of "Bio-ceramic" Tourmaline reduces surface tension in the water and aids in the ionization process. Multiple sediment filters between the various stages remove the suspended solids of one micron or greater and finish filtration to .1M The Biostone Plus is manufactured in the USA with NSF certified components and retails for $69. Buy 3 and receive free shipping! Both the Biostone .1M and the .01M Ultra Filters fit the following water ionizers: *Delphi *Athena *Aquarius *Orion *Melody *Venus *Neptune *Microlite