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This property is a 29-year-old building that originally used galvanized steel pipes (SGP) for its plumbing at the time of completion, but over the years, it has been updated to use vinyl-lined steel pipes (VLP). However, due to the building's structure, the plumbing inside the framework remained galvanized steel pipes (SGP), which led to the occurrence of red water due to corrosion. To address the red water issue in the water supply pipes and to protect and extend the life of the plumbing, NMR Pipe Protectors were installed. The NMR Pipe Protector costs less than one-tenth of traditional plumbing renovation work and can rehabilitate the pipes by converting red rust into black rust without allowing it to flow out. In water quality tests conducted before the installation of the NMR Pipe Protector, the iron ion concentration was 0.3 mg/l. However, about five weeks after the installation of the NMR Pipe Protector, this concentration dropped to 0.01 mg/l, which is one-thirtieth of the original level, effectively resolving the red water issue. Additionally, an endoscopic examination revealed that the rate of blockage due to red rust in the pipes improved by more than 10% after one year and three months. These results confirm that the rust prevention effect of the NMR Pipe Protector and the rehabilitation effect of converting red rust to black rust continue to be effective.