P6.3.2.1 Make sure filter List of Concentration of Replace cartridge is chemical the target cartridge with Incorrect type appropriate for the determinands chemical is appropriate of cartridge chemical(s) to be the filter is more than 50% type. filter for the removed. approved to of its MAV. type of Start keeping remove (this chemical to be Keep a list of filters Wrong filter type a list of check need removed. suitable for used. suitable filter only be removing the types for carried out necessary chemical future once before determinands. reference. the filter is first installed). P6.3.2.2 out regular Records of Cartridges not Develop replacement of filter filter replaced schedule of Contaminant cartridges. maintenance regularly. replacing filter breakthrough and cartridge cartridges. (caused by Regular inspection. Flows too high. replacement. rupture or Put inspection Follow method Inspection exhaustion). Flow rates, or schedule in recommended by records not pressure drop place. the manufacturer to signed off. across the determine when Find out Breakthrough of filter (sudden cartridge can no method target changes in longer remove the recommended determinand. flow or target determinand. for assessing pressure drop when the may indicate a cartridge ruptured filter capacity is or pre-filter). exhausted. Keep flow rate less Monitoring than design Reduce flow to records. maximum. within Target specifications. determinand concentration. 3 The consequences of the event, and therefore the level of risk, will be influenced by the quality of the source water. Preventive measures Checking preventive measures Corrective action Causes What to check Signs that action is needed Event: GROWTH OF GERMS IN THE FILTER Possible hazards: Germs (released from filter into treated water). Level of risk: Moderate4
P6.3.2.1 Incorrect type of cartridge filter for the type of chemical to be removed. Make sure filter cartridge is appropriate for the chemical(s) to be removed. Keep a list of filters suitable for removing the necessary chemical determinands. List of chemical determinands the filter is approved to remove (this check need only be carried out once before the filter is first installed). Concentration of the target chemical is more than 50% of its MAV. Wrong filter type used. Replace cartridge with appropriate type. Start keeping a list of suitable filter types for future reference. P6.3.2.2 Contaminant breakthrough (caused by rupture or exhaustion). out regular replacement of filter cartridges. Regular inspection. Follow method recommended by the manufacturer to determine when cartridge can no longer remove the target determinand. Keep flow rate less than design maximum. Records of filter maintenance and cartridge replacement. Flow rates, or pressure drop across the filter (sudden changes in flow or pressure drop may indicate a ruptured filter or pre-filter). Monitoring records. Target determinand concentration. Cartridges not replaced regularly. Flows too high. Inspection records not signed off. Breakthrough of target determinand. Develop schedule of replacing filter cartridges. Put inspection schedule in place. Find out method recommended for assessing when the cartridge capacity is exhausted. Reduce flow to within specifications. 3 The consequences of the event, and therefore the level of risk, will be influenced by the quality of the source water. Causes Preventive measures Checking preventive measures Corrective action What to check Signs that action is needed Event: GROWTH OF GERMS IN THE FILTER Possible hazards: Germs (released from filter into treated water). Level of risk: Moderate4