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Class 7 Science Chapter 18 of NCERT Solutions is about Wastewater Story. This chapter deals with the treatment of wastewater and the methods used to make it safe for disposal. It covers topics such as sewage, septic tanks, and the process of sewage treatment. Through this chapter, students learn about the importance of conserving water and the need for proper wastewater management to protect the environment. Overall, this chapter is an essential read for students who want to learn about the various methods used to treat and manage wastewater.