Patent ID: 7507372

Claim:
Method for flushing particle-bearing filter beds located in circuit or linear water treatment plants for sterilization and decontamination of said filter beds, wherein the filter is charged with a chlorine dioxide containing aqueous solution, which acts on the deposits of the particle-type filter bed with said bed thereafter being subsequently flushed with water and/or an aqueous medium for removal of the process-caused reaction products and any residual chlorine dioxides; wherein the chlorine-dioxide aqueous solution charges the filter and acts upon the deposits of the particle-type filter bed for a period of time prior to said flushing; wherein the chlorine dioxide-containing aqueous solution is obtained in that a sulfations-containing aqueous solution having a pH value less than or equal to 3 is mixed with a therein stable peroxy compound and said solution is subsequently mixed with the aqueous alkaline solution of a chlorite; wherein the particle-bearing filter bed involves single-/multi-layer filters, which contain quartz, gravel, sand, porous filter materials, and/or carbonaceous materials; and, wherein tetra-chlorine-deca-oxide-complex-dianion [Cl 4 O 10 ] 2− is present in the chlorine dioxide-containing aqueous solution and is in equilibrium with said chlorine dioxide such that said chlorine dioxide is formed during consumption from said aqueous solution.