The Domestic Sewage Recycling Experience Zone is the domestic sewage treatment station of Youfa Group's First Branch. Through treatment processes such as A/O biological contact oxidation, sedimentation, sand filtration, and ozone oxidation, it treats sewage to levels exceeding the third-grade standard of Tianjin's Comprehensive Sewage Discharge Standard, with a treatment capacity of up to 300 cubic meters per day. All treated water is fully reused for production.

    The themed mural "Snow — to the tune of Spring in a Pleasure Garden" created on the exterior wall of the Domestic Sewage Recycling Experience Zone takes Chairman Mao's poem "Snow — to the tune of Spring in a Pleasure Garden" as its creative subject matter, and draws stylistic reference from the painting "This Land So Rich in Beauty" by Mr. Fu Baoshi and Mr. Guan Shanyue. It depicts the majestic grandeur described in the poem — "Mountains dancing like silver serpents, highlands charging like wax-hued elephants, vying with heaven in stature" — as well as the beautiful scene of the vast divine land "clad in red, bedecked in white, enchantingly beautiful" when the clouds part, snow clears, and the morning sun rises. This expresses Youfa Group's deep love and praise for the mountains and rivers of the motherland.