The Vesta Biostone Plus for Filter #2 is for use ONLY in the Vesta GL water ionizer. Check with us if you're not sure which Vesta water ionizer you have. The GAC (granular activated carbon), fiber filters, calcium, and tourmaline combine to provide a revolutionary filter performance. The filter improves water taste and reduces odors. It is particularly effective in removing chlorine and adding calcium.
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.