Adele ring. In mathematics, the adele ring (also adelic ring or ring of adeles) is defined in class field theory, a branch of algebraic number theory. It allows one to elegantly describe the Artin reciprocity law. The adele ring is a self-dual topological ring, which is built on a global field.
Real softeners generally last 20+ years EVEN on ludicrously hard water while the service life on a pre-built softener seems to be under 5 years (if you're lucky) on really hard water and lasting longer than that is a rare exception.
In my area, the hardness is measured in grains per gallon and the value is 10. My water softener is rated at 30,000 grains so I need to regenerate after using 3,000 gallons of water. I use about 100 gallons per day so I regenerate every month.