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Water supply of the 223 dental care units studied in Eastern France in 2016. Note: Filtered water was passed through a 0.2-µm filter to remove impurities and bacteria; Osmosed water was purified through a semi-permeable membrane; Sterile water was free of any micro-organisms and toxins in reference to European pharmacopeia; Distilled water was purified after having been boiled into vapor and condensed back into liquid.
