Composition containing an iron compound, an aluminium silicate and a calcium source useful for the removal of the phosphate ion content of waters

摘要

A composition for removing the phosphate ion content of water comprises: a) 0.1 to 99.9 parts by mass of an iron compound selected from solid hydrous Fe(II) and Fe(III) salts b) 99.9 to 0.1 parts by mass of a porous aluminum silicate containing exchangeable ions and c) 0.1 to 10 moles of a calcium ion source of calcium carbonate with either calcium oxide or calcium hydroxide or both per mole of the iron compound. The components of the composition are dry grounded together.