Tyent's Ultra Filtration...the BEST filters in the water ionizer industry. Tyent's Ultra Filter Set uses a .01 micron filtration level, the same as what is used in kidney dialysis machines. "Ultra Plus" filtration ensures the PUREST, HEALTHIEST and SAFEST alkaline water available on earth. Witness the Amazing Taste and Health Benefits from Tyent's Ultra Filters. We have PROOF that these Ultra filters are the BEST...Ask for our 3rd party filter report TODAY.