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Current IssueOctober 24, 2014
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Ask The Expert: Removing microsporidia
09/03/2002 
 
Question: Q: Kelly Reynolds wrote the article "Microsporidia Outbreak Linked to Water" in the January 2000 WC&P issue. Would you find out whether or not a filter that is certified for "cysts" by NSF will remove microsporidia? Since microsporidia are 0.5 to 1 micron, it appears to me that a 0.5 micron filter such as the Multi-Pure or Amway would remove them. Let me know. I also want to thank you for doing such a fantastic job with WC&P. Your articles are timely, relevant and well written. I look forward to receiving each issue.
Deanna DeLong  

Answer: A: Testing on microsporidia has only begun and removal rates are not fully quantified. Since most microbes are pliable, even pores smaller than the nominal size can pass the microbe, and until we can state with authority by testing the possible removable rates, merely filtering through smaller pores is not an assured method.

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