Patent ID: 6146539
Filing Date: 2000-11-14
Classification: C02F,Y10S

Abstract:
A method of removing dissolved phosphate from the water of a swimming pool, where the swimming pool is fitted with a filter and with means for circulating water from the pool through the filter, the method including the steps of:introducing into the filter or forming in situ within the filter a particulate reagent comprising a lanthanide compound which is (i) substantially insoluble in pool water at pH 6-8, (ii) adapted to be retained within the filter, and (iii) adapted to react with dissolved phosphate in the pool water to produce a substantially insoluble particulate reaction product including phosphate, said reaction product also being adapted to be retained within the filter, andcirculating water from the swimming pool through the filter to bring the water into contact with said reagent to form said reaction product within the filter, thereby removing dissolved phosphate from the pool water.