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3. Hagare P, Dharmappa H.B. Wastewater Recycle, Reuse, And Reclamation – Vol. II - On-Site Sanitation Technologies for Reuse
4. Govt. of India MoEF & CC Lok Sabha Unstarred Question No. 2541 & answered on 01-August 2017
5. http://www.sulabhenvis.nic.in/Database/STST_wastewater_2090.aspx