P6.3.1.3 Make sure the Particle Cloudiness in Read filter cartridge is fitted counting or the water Cartridge is the correct way microscopic following instructions. incorrectly (some are particle filtration. seated. unidirectional). analysis test Filter unable to results, or the Make sure base of remove more results of any filter housing is than 99.9% of test wiped clean before particles approved by reseating filter greater than 2–3 the Ministry of cartridge. µm in size Health. entering it. Make sure cover is replaced properly. Customer complaints. Conduct test to check satisfactory Cases of particle removal giardiasis or immediately after changing or in the reseating filter (see community Section 11 of associated with DWSNZ: 2000). periods of poor water quality. Make sure the Train staff if Frequent person replacing necessary. incorrect the cartridges seating of filter. knows the correct way to do it. Event: FILTER NOT REMOVING PARTICLES DOWN TO 2-3 µm IN SIZE cont’d P6.3.1.4 Carry out regular Flow rates, or Cloudiness in Wash the filter replacement of filter pressure drop the water cartridge and Failure of cartridges, and across the following discharge to cartridge. washing of filter. (Sudden filtration. waste until it and maintain changes in can be Filter unable to records of when this flow or demonstrated remove more is done and what is pressure drop that particle than 99.9% of done. may indicate a removal is particles ruptured filter again Make sure new greater than 2-3 or pre-filter.) effective. batches of µm in size cartridges have Particle entering it. Obtain certificates showing counting or another batch Customer they meet microscopic of cartridges. complaints. specifications particle Consider Cases of before buying. analysis test changing giardiasis or results, or the supplier. results of any in the test community approved by associated with the Ministry of periods of poor Health. water quality. Quality Records not maintained. with cartridges.
P6.3.1.3 Cartridge is incorrectly seated. Make sure the cartridge is fitted the correct way (some are unidirectional). Make sure base of filter housing is wiped clean before reseating filter cartridge. Make sure cover is replaced properly. Conduct test to check satisfactory particle removal immediately after changing or reseating filter (see Section 11 of DWSNZ: 2000). Particle counting or microscopic particle analysis test results, or the results of any test approved by the Ministry of Health. Cloudiness in the water following filtration. Filter unable to remove more than 99.9% of particles greater than 2–3 µm in size entering it. Customer complaints. Cases of giardiasis or in the community associated with periods of poor water quality. Frequent incorrect seating of filter. Read filter instructions. Make sure the person replacing the cartridges knows the correct way to do it. Train staff if necessary. Event: FILTER NOT REMOVING PARTICLES DOWN TO 2-3 µm IN SIZE cont’d P6.3.1.4 Failure of cartridge. Carry out regular replacement of filter cartridges, and washing of and maintain records of when this is done and what is done. Make sure new batches of cartridges have certificates showing they meet specifications before buying. Flow rates, or pressure drop across the filter. (Sudden changes in flow or pressure drop may indicate a ruptured filter or pre-filter.) Particle counting or microscopic particle analysis test results, or the results of any test approved by the Ministry of Health. Quality with cartridges. Cloudiness in the water following filtration. Filter unable to remove more than 99.9% of particles greater than 2-3 µm in size entering it. Customer complaints. Cases of giardiasis or in the community associated with periods of poor water quality. Records not maintained. Wash the filter cartridge and discharge to waste until it can be demonstrated that particle removal is again effective. Obtain another batch of cartridges. Consider changing supplier.
treatment-cartridge-filtration-feb14-v2.docx