Cartridge filtration Event: FILTER NOT REMOVING PARTICLES DOWN TO 2 µm IN SIZE Possible hazards: Large germs (Giardia and Cryptosporidium not removed). Level of risk: High4 C1.5.1 Use filters that are National or Cloudiness in the Change to a certified to remove international water following different type of Wrong type of particles down to 2 m certificate of filtration. filter. cartridge filter. in size. filter’s Customer Keep list of capabilities.5 Make sure filter complaints. filters that cartridge is Record of filter match the Cases of compatible with the types used. housing in use. diarrhoea in filter housing and note people drinking the type of filter used. the water. Wrong filter type used. C1.5.2 Check the condition of The state of the Cloudiness in the Decide whether the filter housing and filter seal. water following the cartridge or Damage to the the cartridge seal filtration. housing is seal between Filter when changing filters. damaged, and the cartridge maintenance Customer replace and filter Make sure the person log. complaints. damaged unit. housing. replacing the Appearance of Cases of cartridges knows the Train staff in the water. diarrhoea in correct way to do it. replacing people drinking cartridges if the water. necessary. Frequent damage Read filter to seal. manufacturer’s instructions. C1.5.3 Make sure the Results from Cloudiness in the Read filter cartridge is fitted the particle removal water following manufacturer’s Cartridge not correct way round checks. filtration. instructions. properly seated (some only work one in the mounting. Appearance of Filter unable to Train staff in way). the water. remove more than replacing Make sure base of 99.9% of particles cartridges if filter housing is wiped greater than 2 µm necessary. clean before reseating in size entering it. filter cartridge. Customer Make sure cover is complaints. replaced properly. Cases of Check, directly after diarrhoea in re-seating it, that the people drinking filter is removing the water. particles. (Checks Frequent incorrect are described in seating of filter. Sections 3.2.3.1 and 11 of DWSNZ: 2000). Make sure the person replacing the cartridges knows the correct way to do it. 4 The level of risk will depend on the type, and effectiveness, of any disinfection after cartridge filtration. 5 For example, certification under NSF Standard 53 or AS/NZ 4348:1995.
Cartridge filtration Event: FILTER NOT REMOVING PARTICLES DOWN TO 2 µm IN SIZE Possible hazards: Large germs (Giardia and Cryptosporidium not removed). Level of risk: High4 C1.5.1 Wrong type of cartridge filter. Use filters that are certified to remove particles down to 2 m in size. Make sure filter cartridge is compatible with the filter housing and note the type of filter used. National or international certificate of filter’s capabilities.5 Record of filter types used. Cloudiness in the water following filtration. Customer complaints. Cases of diarrhoea in people drinking the water. Wrong filter type used. Change to a different type of filter. Keep list of filters that match the housing in use. C1.5.2 Damage to the seal between the cartridge and filter housing. Check the condition of the filter housing and the cartridge seal when changing filters. Make sure the person replacing the cartridges knows the correct way to do it. The state of the filter seal. Filter maintenance log. Appearance of the water. Cloudiness in the water following filtration. Customer complaints. Cases of diarrhoea in people drinking the water. Frequent damage to seal. Decide whether the cartridge or housing is damaged, and replace damaged unit. Train staff in replacing cartridges if necessary. Read filter manufacturer’s instructions. C1.5.3 Cartridge not properly seated in the mounting. Make sure the cartridge is fitted the correct way round (some only work one way). Make sure base of filter housing is wiped clean before reseating filter cartridge. Make sure cover is replaced properly. Check, directly after re-seating it, that the filter is removing particles. (Checks are described in Sections 3.2.3.1 and 11 of DWSNZ: 2000). Make sure the person replacing the cartridges knows the correct way to do it. Results from particle removal checks. Appearance of the water. Cloudiness in the water following filtration. Filter unable to remove more than 99.9% of particles greater than 2 µm in size entering it. Customer complaints. Cases of diarrhoea in people drinking the water. Frequent incorrect seating of filter. Read filter manufacturer’s instructions. Train staff in replacing cartridges if necessary. 4 The level of risk will depend on the type, and effectiveness, of any disinfection after cartridge filtration. 5 For example, certification under NSF Standard 53 or AS/NZ 4348:1995.
example-small-rainwater-supply-feb14-v2.docx