<p>The present invention provides an effective builder composition comprising two precipitating builders which are (a) an alkali metal carbonate and (b) an alkali metal silicate; calcium carbonate; and a building enhancer. This building enhancer is a compound capable of precipitating magnesium ions from hard water selected from the group comprising alkali or alkaline earth metal oxides or hydroxides and alkali metal aluminate, zincate or titanate.</p>
