<prompt> The Nalgonda technique consist of what sequence of compounds addition?Filter alum , lime , bleaching powderLime, filter alum, bleaching powderBleaching powder, lime, filter alumBleaching powder , lime, bleaching powder  <response>: - Nalgonda technique was developed at NEERI Nagpur in 1974 by Nawlakhe and reported by Bulusu in 1988.- Addition sequence is Sodium aluminate Filter alum, lime, and bleaching powder to fluoride water followed by Filtration, Sedimentation and Flocculation.- Also note in mixing:a. rapid mixing - 30-60 seconds with a speed of 10-20 rpmb. slow mixingduring flocculation - 10-15 minutes with 2-4 rpm speed. 