Domestic Cold Water Supply Pipe in a 20-Year-Old Apartment (PLP)

A 20-year-old apartment building experienced internal corrosion in its domestic cold water supply piping. Water analysis conducted before the installation of Pipetector showed a chlorine concentration of 0.11 mg/L and an iron concentration of 0.27 mg/L. These results indicated that residual chlorine levels had decreased while dissolved iron levels had increased, suggesting ongoing internal corrosion within the piping system.

Water samples collected under the same conditions two weeks after the installation of Pipetector showed that the chlorine concentration had increased to 0.52 mg/L, while the iron concentration had decreased to 0.17 mg/L. After six weeks, the chlorine concentration remained relatively stable at 0.42 mg/L, and the iron concentration had declined further to 0.12 mg/L.

To further evaluate corrosion, a white filter was attached to a bathtub faucet before the installation of Pipetector. After 14 days, the filter had turned yellowish-brown due to iron deposits from the water, and the measured iron content captured by the filter was 13 mg/L. These findings indicated significant deterioration caused by internal pipe corrosion.

When we attached another white filter after 4 weeks of the installation in the same conditions as before, the discoloration rectified, and iron particles were hardly seen. The level of iron content also declined to 4.8 mg/L.

Based on these results, Pipetector not only suppressed the progression of internal pipe corrosion but also helped maintain residual chlorine levels in the domestic cold water supply system. At the same time, the dissolution of iron into the water was significantly reduced. These findings demonstrate that Pipetector is effective in mitigating internal corrosion and preventing the associated decline in residual chlorine concentration.