The weakly acidic cation resins have carboxylic groups as the exchange site. The resin is highly efficient, for it is regenerated with nearly 100% stoichiometric amount of acid, as compared to the 200-300% required for strong acid cations. The weak acid resins are subject to reduced capacity from increasing flow rate, low temperatures, and a hardness-to-alkalinity ratio below 1.0. They are used very effectively in conjunction with a strong acid cation resin operating in the hydrogen form, in either a separate bed or stratified bed configuration.
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