| http://www.w3.org/ns/prov#value | - optionally an alkaline salt selected from alkali metal silicates, alkali metal carbonates, alkali metal phosphates and mixtures thereof, in which the moisture content of the base powder, i.e. the water content which is lost at heating to 135 C, is maintained at a certain level, which level is defined by a particular formula, in order to improve the initial and long term ion exchange properties of
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