An experiment was conducted on a remote island in Munakata City, where people were asked to use only additive-free soap for bathing and washing clothes. As a result, the water discharged from a sewage treatment plant into the sea became cleaner, according to a survey conducted by Munakata City, soap makers, and others. This study was undertaken jointly by Munakata City, Kitakyushu City soap manufacturers, and Yamaguchi University to investigate how the environment changes when synthetic detergents containing chemical substances are replaced with additive-free soaps. In the experiment, about 140 residents of Jinoshima, a remote island in Munakata City, were asked to use only additive-free soap for bathing and washing clothes for three months from last September. As a result, organic matter in the water discharged from the island’s sewage treatment plant into the sea was reduced, and the water quality improved. Source: NHK
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