As the number of climbers increased in the past few decades, human waste became the biggest problem of Mount Fuji. When the amount of waste exceeded the disposal capacity of the mountain's toilet system, undecomposed toilet papers were discharged on the mountain, which people called "White River".
To solve this problem, which is essential to become a UNESCO World Heritage, the mountain's toilets have been dramatically improved. The types of high-technology toilets installed on Mount Fuji include Incineration-method toilet, oyster-shell-method toilet, and biotoilet.

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