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Shepperton Film Studios (Hotel) is a historic filming studio located in Surrey, on the outskirts of London. The first building was constructed in 1689, and after suffering a fire, it was rebuilt in 1902 and later renovated in 1936 to serve as a hotel for film actors. There was an issue with red rust in the plumbing, but plumbing work could not be done as it would affect the appearance of the building, which is registered as a Grade II cultural heritage site. Therefore, the NMR Pipe Protector PT-30DS was installed in the hot water plumbing to prevent red rust without affecting the building's exterior. In the men's restroom, where galvanized steel pipes are used, the iron content in the water of the hot water plumbing was 20 mg/l before the installation of the NMR Pipe Protector, but it decreased to 0.37 mg/l after 10 weeks of installation. In the first-floor kitchen, the iron content reduced from 14.5 mg/l before installation to 0.386 mg/l after 10 weeks. From the above, it can be concluded that the occurrence of new red rust in the hot water plumbing has been completely prevented, and the existing red rust has transformed into black rust, which is passive and insoluble in water, thereby proving the rust prevention effectiveness of the NMR Pipe Protector.

This property has been in existence for 33 years, and due to significant red rust blockage at the joints of the water supply pipes made of different metals, we adopted the pipe rehabilitation device "NMR Pipe Protector." Before the installation of the NMR Pipe Protector, a white filter was attached to the kitchen sink water supply faucet for seven days, during which the filter became discolored brown due to red rust generated in the water supply pipes. After dissolving the captured iron content with purified water and measuring the iron concentration, it was found that the iron level in the water was 21 mg/l, indicating that the red rust corrosion in the pipes was quite advanced. One month after installation, a white filter was attached under the same conditions as before, and it was confirmed that the filter's discoloration had reduced to light brown, with the iron concentration decreasing significantly to 5.8 mg/l. Additionally, six months after installation, a white filter was again attached under the same conditions, and it was confirmed that the filter's discoloration had nearly returned to white, with the iron concentration further decreasing significantly to 0.75 mg/l. From this, it can be concluded that just one month after the installation of the NMR Pipe Protector, the progression of red rust was completely halted, and at the same time, the surface of the red rust in the water supply pipes transformed into a non-soluble black rust, resulting in a reduction of iron leaching into the water and a decrease in filter discoloration.

St. Ignatius Church, also known as the Catholic Kojimachi Church, is a historic church adjacent to Sophia University that has existed since before the war. Four years ago, it was found that the red rust deterioration in the air conditioning chilled and hot water piping, which is 19 years old, was progressing. Therefore, an evaluation of the rust prevention effect of the "NMR Pipe Protector," a red rust prevention extension device, was conducted. Before the installation of the NMR Pipe Protector, a sample of the circulating chilled and hot water was taken, revealing that the water was brownish in color. Water quality testing detected a total iron concentration of 240 mg/l, indicating significant progression of red rust corrosion within the piping. After installing the NMR Pipe Protector, a water sample was tested two weeks later, showing that the water had become almost clear, with the total iron concentration due to red rust reduced to 2.7 mg/l, a significant decrease. At the same time that the progression of red rust was halted, the surface red rust within the chilled and hot water piping and the red rust in the water transformed into inert black rust that does not dissolve in water. This provided verification of the rust prevention effect of the NMR Pipe Protector within the chilled and hot water piping. This result was featured in an article published on July 18, 2018, in issue 2737 of "Air Conditioning Times," which reported on the verification of the rust prevention effect of the NMR Pipe Protector at St. Ignatius Church.