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Year : 2011  |  Volume : 9  |  Issue : 17  |  Page : 122-127

Efficacy of Various Commercially Available Water Purification Filters, in Reducing the Level of Concentration of Fluoride, in Drinking Water

Department of Preventive and Community Dentistry,Kanti Devi Dental College and HospitaMathura, India

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Source of Support: None, Conflict of Interest: None

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Objective: To compare the efficacy of commercially available water purification filters in reducing the fluoride levels in drinking water with varying concentrations of fluoride. Material and Methods: Distilled water was used to prepare water samples with fluoride concentration of 1, 2,3,4,6 and 8 ppm using reagent NaF. Each water sample was subjected to filtration using: reverse osmosis system, activated carbon, combination of reverse osmosis and u-v, membrane and candle filters. In addition to these, a household defluoridation technique (stacked matka) was also used. The fluoride concentration in the samples was analyzed after filtration, using the spectrophotometer and reduction in the fluoride concentration was calculated. Statistical analysis was done using One-Way ANOVA and Post hoc Tukey's test. Level of significance was set at p :S:: 0.05. Results: All water purification filters showed significant reduction in fluoride concentration of water samples with varying concentration of fluoride. The highest reduction in the fluoride concentration was shown by the combination of reverse osmosis + u-v (0.297 ΁ .001) and reverse osmosis (0.3050 ΁ 0.001) followed by activated carbon (0.3240 ΁ .002) with least reduction shown by the membrane (0.987 ΁ .001) and candle filters (0.8330 ΁ .001). Conclusion: The amount of fluoride removed due to purification varies from one type of system to the others and these water purification systems can be effectively used in the fluoride endemic areas.

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