Reliable information about water quality is essential for the proper management of a water supply. Knowledgeable and skilled staff are also essential for minimising the public health risks associated with water supplies. Please read the staff training (Guide and the G1) monitoring guides (Guide While we haven’t pointed out every detail of how these G2). documents are linked with the present document, the links are many and are important. Abbreviations: DWSNZ Drinking-Water Standards for New Zealand – Preventive measures Checking preventive measures Corrective action Causes What to Signs that action is needed Event: FLUORIDE CONCENTRATION GREATER THAN REQUIRED FOR DENTAL PROTECTION Possible hazard: Fluoride Level of risk: High P9.1.1 Make sure chemicals Fluoride Fluoride Label chemical supplied are concentration bins. Fluoride delivered to the more than dosing Supplier is correct bins or 1 mg/L. solution (day Supplier’s required to containers; clearly tank) prepared certificate of Chemical bins ensure that label bins; ensure that at the wrong analysis. not labelled. operator is operator is on site concentration, present when Checks show when chemicals are or using the chemicals are dosing delivered. wrong fluoride delivered. solution chemical, or Make sure dosing concentration Instigate spillage of solution incorrect. checks. fluoride concentration is Notification of Change chemical into cross checked (by a spillage. supplier. solution second person) after preparation preparation and Cross checks tank. before use; check not signed off. purity of chemicals supplied. Train staff in Identify staff preparation of training needs fluoride dosing and provide solutions (including training. calculations). Arrange for split Schedule regular split sample analysis. samples of fluoridated finished water to be analysed by an external approved, laboratory. P9.1.2 Install a devise to Absence of a Install a prevent backflow into backflow backflow the water supply (see preventer. preventer. from Guide D2.4). day tank. Event: FLUORIDE CONCENTRATION GREATER THAN REQUIRED FOR DENTAL PROTECTION cont’d P9.1.3 Routine maintenance Identify Fluoride cause of schedule for dose fault and rectify. Dosing system controller, or flow malfunction. proportional dosing Maintenance system, (whichever is log. appropriate) and Fluoride dosing pump (see weight/ Guide P10).
Reliable information about water quality is essential for the proper management of a water supply. Knowledgeable and skilled staff are also essential for minimising the public health risks associated with water supplies. Please read the staff training (Guide G1) and the monitoring guides (Guide G2). While we haven’t pointed out every detail of how these documents are linked with the present document, the links are many and are important. Abbreviations: DWSNZ – Drinking-Water Standards for New Zealand Causes Preventive measures Checking preventive measures Corrective action What to Signs that action is needed Event: FLUORIDE CONCENTRATION GREATER THAN REQUIRED FOR DENTAL PROTECTION Possible hazard: Fluoride Level of risk: High P9.1.1 Fluoride dosing solution (day tank) prepared at the wrong concentration, or using the wrong fluoride chemical, or spillage of fluoride chemical into solution preparation tank. Make sure chemicals supplied are delivered to the correct bins or containers; clearly label bins; ensure that operator is on site when chemicals are delivered. Make sure dosing solution concentration is cross checked (by a second person) after preparation and before use; check purity of chemicals supplied. Fluoride Supplier’s certificate of analysis. Fluoride concentration more than 1 mg/L. Chemical bins not labelled. Checks show dosing solution concentration incorrect. Notification of spillage. Cross checks not signed off. Label chemical bins. Supplier is required to ensure that operator is present when chemicals are delivered. Instigate checks. Change supplier. Train staff in preparation of fluoride dosing solutions (including calculations). Schedule regular split samples of fluoridated finished water to be analysed by an external approved, laboratory. Identify staff training needs and provide training. Arrange for split sample analysis. P9.1.2 from day tank. Install a devise to prevent backflow into the water supply (see Guide D2.4). Absence of a backflow preventer. Install a backflow preventer. Event: FLUORIDE CONCENTRATION GREATER THAN REQUIRED FOR DENTAL PROTECTION cont’d P9.1.3 Dosing system malfunction. Routine maintenance schedule for dose controller, or flow proportional dosing system, (whichever is appropriate) and dosing pump (see Guide P10). Fluoride Maintenance log. Fluoride weight/ Identify cause of fault and rectify.
treatment-fluoridation-feb14-v2.docx