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.
Water softeners are built to last for at least 10 years. When properly maintained, the softeners can last several years beyond that time.
If there is any iron in the water it can settle in the gravel under-bedding of the softener over time and when the system regenerates this gets stirred up but not completely flushed out. This will impart a musty type smell to water and can last 1-2 days after a regeneration.