Strong acid exchange resin is a kind of cation exchange resin with sulfonic acid group (- SO3H) as the main exchange group, which can be reused.

The use of ordinary mineral acids is the same. The type of softened water resin is strong acid ion exchange resin. The special catalyst type resin must be used, because it is also related to the influence of hydrogen ion release rate, pore size and crosslinking degree on the reaction.

In industrial application, the advantages of ion exchange resin are large treatment capacity, wide decolorization range, high decolorization capacity, removal of various ions, repeated regeneration, long service life and low operation cost (although the cost of one-time investment is large). A variety of new technologies based on ion exchange resin, such as chromatographic separation, ion exclusion, electrodialysis, etc., have their own unique functions and can carry out various special work, which is difficult to do by other methods. The development and application of ion exchange technology is still developing rapidly.