<prompt> In Nalgonda Technique of deflouridation addition of the ___ in following sequence:Alum,lime, bleaching powder.Lime,alum, bleaching powder.Bleaching powder, alum ,lime,Bleaching powder,lime,alum.  <response>: Nalgonda technique was developed by the national environmental engineering research institute NEERI at Nagpur in 1974. The process comprises Addition in sequence of sodium aluminate filter alum, lime and bleaching powder to fluoride water followed by flocculation, sedimentation, and filtration. The technique is extremely useful for both domestic as well as for community water supplies. 