Patent ID: 8403726

Claim:
A system for cleaning at least a section of a water supply pipe riser in a building having a first supply pipe riser including at least one first supply pipe riser outlet and a second supply pipe riser including at least one second supply pipe riser outlet, said second supply pipe riser isolated from said first supply pipe riser, said first supply pipe riser and said second supply pipe riser having previously been emptied and dried, and wherein said at least a section comprises a portion of said second supply pipe riser, said system comprising: a supply of compressed gas for supplying a stream of compressed gas into an inlet of said first supply pipe riser; an air-impermeable conduit connecting a one of said at least one first supply pipe riser outlets to a corresponding one of said at least one second supply pipe riser outlets such that pressurizing the first supply pipe riser pressurizes the second supply pipe riser; a supply of abrasive particles for cleaning an interior of said at least a section, said supply of abrasive particles connected between said inlet and said at least a section.