Fits all Aqua Ionizer Deluxe™ series water ionizers. Removes chlorine, odor and filters dissolved solids from source water. Cleans and treats 4,000 liters each. It is reccomended to change your filter every 4-6 months under normal use of your water ionizer.Other filters are availible including internal mineral filters. If your source water is from a well, you may need an in-line mineral filter or a combination carbon and mineral filter.