The cationic resins are divided in two; strong acid and weak acid. Strong acid ones exchange cations and can work at any pH. It is used primarily in water softening applications as the first deionization stage in softeners or multimedia filters. It removes cations from the water and they need a large amount of regenerant. (Commonly hydrochloric acid [HCl]). On the other hand, the weak acid cationic resin has a lower exchange capacity, they are not functional at low pH, they swell and contract constantly, thus increasing pressure losses or causing ruptures in the tanks when they do not have enough space inside. . However, it is a very efficient resin and it does need less acid for regeneration and it is common to regenerate them with the waste acid from strong acid resins.
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