02-28-2021, 05:32 PM
Does anyone know what filters, if any, are effective?
The UHH Pharmacy Rat Lungworm FAQ offers this mixed messages recommendation about filter sizes:
IN 2010? WHO GATHERED THE DATA? WOULD YOU MENTION (FOR CATCHMENT USERS) THAT A 20 MICRON SEDIMENT FILTER WILL BLOCK THE 3RD INSTAR?
This data was collected by the Hawaiʻi State Dept. of Health. Most cases were from the island of Hawaiʻi.
The CDC suggests that a 20 micron filter would probably be adequate. However, the 20 micron size pressure will only flatten the larvae against the filter, making them wider, which could still allow them to stretch out thin and get through when there was no pressure being exerted. Use of at least a 15 micron filter is preferred.
If chlorine is being used as water treatment, then one should also be using a 1-micron filter anyway for protozoa. If using a UV system, then it is recommended to filter down to a 5 micron plus have the UV rated to inactivate nematodes. (Class A). A 20-micron filter alone is really just a sediment filter and not adequate treatment for anything else.
Reference: Patricia Macomber, MPH, CTAHR/University of Hawaiʻi. Komohana Research and Extension Center.
https://pharmacy.uhh.hawaii.edu/rat-lung...-questions
The UHH Pharmacy Rat Lungworm FAQ offers this mixed messages recommendation about filter sizes:
IN 2010? WHO GATHERED THE DATA? WOULD YOU MENTION (FOR CATCHMENT USERS) THAT A 20 MICRON SEDIMENT FILTER WILL BLOCK THE 3RD INSTAR?
This data was collected by the Hawaiʻi State Dept. of Health. Most cases were from the island of Hawaiʻi.
The CDC suggests that a 20 micron filter would probably be adequate. However, the 20 micron size pressure will only flatten the larvae against the filter, making them wider, which could still allow them to stretch out thin and get through when there was no pressure being exerted. Use of at least a 15 micron filter is preferred.
If chlorine is being used as water treatment, then one should also be using a 1-micron filter anyway for protozoa. If using a UV system, then it is recommended to filter down to a 5 micron plus have the UV rated to inactivate nematodes. (Class A). A 20-micron filter alone is really just a sediment filter and not adequate treatment for anything else.
Reference: Patricia Macomber, MPH, CTAHR/University of Hawaiʻi. Komohana Research and Extension Center.
https://pharmacy.uhh.hawaii.edu/rat-lung...-questions