<prompt> Nalgonda technique is related to___ content in waterFluorineChlorineNitrateNitrites  <response>: Ans. A. Fluorine. Ref. Parks Textbook of PSM 22ndpg.598Nalgonda technique is used for defluoridation of water. The technique is devised by National Environment EngineeringResearch Institute, Nagpur. It involves addition of lime alum in sequence followed by flocculation, sedimentation and filtration.Endemic Flurosis: The permissible concentration of fluorides in drinking water is 0.5 to 0.8 mgL. Where drinking water contains excessive amounts of fluorine 3-5mgL, endemic Flurosis has been observed. Certain parts of the country, e.g., Andhra Pradesh, Punjab, Haryana, Karnataka, Kerala and TN are known for it. Dental Flurosis: Ingested during the years of tooth calcification essentially during the first 7 years of life by mottling of dental enamel, which has been reported at levels above 1.5 mg1 intake. Mottling is best seen on the incisors of the upper jaw. Skeletal Flurosis Genu valgum: Lifetime daily intake of 3.0-6.0 mg1 or more. Prevention: Changing the water source. The use of fluoride toothpaste in areas of endemic flurosis is not recom for children upto 6 yrs of age. Nalgonda technique for defluoridation of water. 