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Findings and Recommentiations In the course of its study, the committee found little evidence to indicate that impurities present in direct drinking water additives cause gross contamination of water supplies. m erefore, the committee does not believe there is cause for alarm regarding the purity of direct drinking water additives currently used in the United States. Nonetheless, impurities of concern are known or suspected to be present in additives, and the committee recommends that the water treatment industry adopt voluntary standards of purity for these additives. It is also recommended that more extensive data based on the purity of drinking water additives be developed and that this information be used to continuously revise and update this Codex. 1