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Sawer Point One Questions – Continued

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PostedMay 19, 2015 at 11:13 am

In This Thread questions regarding the Sawyer Point One were raised by Murray et al of Tuft’s University.

As noted in the thread, Sawyer had a response challenging the findings.

In addition, Lindquist and Norman of Messiah College challenged the findings.

I communicated directly with Anna Murray, lead author of the Tuft’s paper. She provided a pdf of the Linquest paper, as well as a pdf of her rebuttal.

A summary would be: 1) Yes, it was Not a controlled study, 2) contamination was found Inside the fibers, 3) burst fibers away from the breached end were observed 4) e. coli did pass through the filters.

These two additional articles are behind a “professional” firewall.

I asked the author about posting these docs and she replied –

Hi Greg,
Thank you for asking.

Unfortunately we are not allowed to post papers on forums for copyright reasons. However, it would be perfectly acceptable for you to summarize and cite the papers, as you suggested.

Additionally, we (I, you, others) can send the pdfs to individuals who request to read the paper for personal use.

All the best,
Anna

If you are interested I would be glad to email the Lindquist Review and Murray Response. And please summarize and cite if you post elsewhere. Thanks.

greg attt smgm dottt org

PostedMay 20, 2015 at 12:54 pm

Thanks Greg for both tracking down and sharing the documents with me. I encourage other folks to take Greg up on his offer. I understand that the docs cannot be publicly posted, but can be shared individually.

It is a complex issue, so take some time and look into it.

The filters in the field seemed to be failing and and passing through an alarming amount of E coli. Once the testers thoroughly cleaned two of the filters (hot water, vinegar, etc) they could not detect any E coli. The water was still turbid and had other bacteria, but reading is that the cleaned filters were back to filtering out the bad stuff.

For myself, I will take this information and be more rigorous about maintaining and cleaning my filters and will continue to use them with confidence.

Anyway, message Greg and ask for the papers.

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