Cation Resins are widely used in the water treatment industry.
Strong acid cation resins have the sulfonic acid as function groups. They can work at any pH 0-14, and tolerate high temperature and absorb all cations. Applications like this will require substantial amounts of regeneration. These resins are mainly used for water softening applications where total hardness needs to be removed, demineralization before anion beds or as the cation component of mixed bed resin.