Studies in the field, this time with the objective to study the efficacy of chemical-coated sand with fossils, 1%. A 50 g sachet packing type to prevent mosquito larvicide in the reservoir with the use of circulating water in the area, a Community ban Nong cichlid. Ban Pong district in Ratchaburi province cichlid is a 3-month period for containers used in the test was 200-litre size, number of leaves 35 more consumption, chemical-coated sand with fossils, 1%. The number of 20 grams per 200 liters, using more and more testing is 30 5 control survey in water test every week, more balls for a period of 12 weeks beginning in February, April and ending 2555 2555 summary data analysis using descriptive statistics. The study found that every test put more sand coating containing fossil 1%. Effective in preventing the occurrence of mosquito larvicide has 100% for a period of 12 weeks in the community with the use of a water-and-rotate regularly in mosquito larvicide at test level of 83.3% – 100.
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