The Internal GUF Ultra .01M Filter is designed for the Vesta GL water ionizer only. Check with us if you're not sure which Vesta water ionizer you have. The ultra-fine dual filtration (up to 0.01 micron) conditions the quality of any tap water prior ionization and removes all bacteria, cysts, fungi, viruses, etc.
This Video Shows Filter-Changing for the Vesta
Filter 1 is on the left as you're facing the back of the machine and Filter 2 is on the right.