Sorry for the wrong link. The correct link for paper is; http://www.nariphaltan.org/watersterlization.pdf
Cheers. Anil On Thu, Feb 14, 2013 at 9:17 AM, nari phaltan <[email protected]> wrote: > Thanks for an interesting discussion. I am again putting the story on our > work in case it was missed. > http://news.in.msn.com/national/article.aspx?cp-documentid=252177469 > > Most of the women in rural areas in our part of India heat water for bath. > The away to know that water has been heated is by putting hand in the > water. At 60 degrees celsius one can hardly keep the hand for 4-5 seconds > in water. This is a good indicator of temperature. Thus filtering dirty > water through 4 layers of sari and then heating to 60 degrees Celsius is > safe for drinking purposes. > > The full paper is at; www.nariphaltan.org/watersterilizaion.pdf > > Cheers. > > Anil > > On Thu, Feb 14, 2013 at 8:53 AM, Bruce Stahlberg < > [email protected]> wrote: > >> Agreed. This is the price on the internet from SCI. They typically use >> the funds to help out with projects elsewhere. Especially in bulk the >> price per unit would be much less. Does anyone have any experience of >> making them? >> >> Bruce >> >> On Wed, Feb 13, 2013 at 8:45 PM, Crispin Pemberton-Pigott < >> [email protected]> wrote: >> >>> Dear Bruce, Tom and All**** >>> >>> ** ** >>> >>> I recall the pasteurization indicator being pitched to our Rotary Club >>> in Swaziland and it was much less than $9 so I suspect it is an >>> ‘advertised’ or ‘list’ price. There must be a bulk price as well. **** >>> >>> ** ** >>> >>> Regards**** >>> >>> Crispin**** >>> >>> ** ** >>> >>> ++++ >>> >>> Tom, all, >>> >>> Using the sari to pre-filter the water is a great idea especially where >>> the water is particularly dirty before treatment. If I understand right it >>> is a pre-treatment and the water may not be drinkable until treated or at >>> least tested to find out if it needs treatment. >>> >>> The Water Pasteurization Indicator (WAPI) is the lowest of the >>> technologies for testing the temperature of water that is offered by Dr. >>> Metcalf and others. For those who want more information about a WAPI: >>> >>> >>> http://www.sunoven.com/products-page/accessories/water-pasteurization-indicator-wapi >>> >>> Of course, boiling is another, cheaper way to test the temperature. The >>> downside is that it requires more energy than is needed. The WAPI melts at >>> 65 C enough to kill 99% of the bacteria that causes problems for human >>> consumption versus 100 C for boiling. I believe the Peace Corps still >>> advises boiling for 20 minutes or at least a period of time. >>> >>> As can be seen from the link, a WAPI is $9 on the SCI site which is out >>> of reach of the populations mostly served by folks on this list. On the >>> plus side, the technology is simple, transportable, can be reused and could >>> be made in country if the wax was available. I am not sure of the >>> availability of the wax. >>> >>> The other techniques are higher up the technology chain. One is a 3M >>> product (which I am not mentioning because I am from Minnesota) and is used >>> to test E. Coli here in the states. There is a cost to each test packet >>> and I am not aware of this cost. The benefit is that it can be tested on >>> site without the need for any high tech equipment and does not require any >>> electricity, just the temperature of the human body and time. >>> >>> >>> http://solutions.3m.com/wps/portal/3M/en_US/Microbiology/FoodSafety/product-information/product-catalog/?PC_7_RJH9U523003DC023S7P92O3O87000000_nid=C0WJ62882Vbe29BDXSBJ7Fgl >>> >>> Tom, do you know the availability and cost of these? I think I saw $2 >>> per test plus a small amount for a clean pipet. Not ideal for families but >>> one way to test and confirm water quality in remote areas. >>> >>> I agree that low tech solutions are the best. The WAPI can be used in >>> conjunction with the sun to know if the water temperature hit the right >>> mark. When the wax is on the bottom it was hot enough. If not, then the >>> water is not safe to drink. >>> >>> For those of us who have the luxury of clean water at our fingertips I >>> appreciate everyone who works on ways to provide clean water to the other >>> 90% of the population. Thanks to you all. >>> >>> Bruce >>> >>> **** >>> >>> _______________________________________________ >>> Stoves mailing list >>> >>> to Send a Message to the list, use the email address >>> [email protected] >>> >>> to UNSUBSCRIBE or Change your List Settings use the web page >>> >>> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org >>> >>> for more Biomass Cooking Stoves, News and Information see our web site: >>> http://www.bioenergylists.org/ >>> >>> >>> >> >> >> -- >> Bruce Stahlberg >> Affordable Energy Solutions, Inc. >> 3535 East Lake Street >> Minneapolis, MN 55406 >> 612.724.8977 >> www.affordableenergysolutions.com >> >> >> >> _______________________________________________ >> Stoves mailing list >> >> to Send a Message to the list, use the email address >> [email protected] >> >> to UNSUBSCRIBE or Change your List Settings use the web page >> >> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org >> >> for more Biomass Cooking Stoves, News and Information see our web site: >> http://www.bioenergylists.org/ >> >> >> > > > -- > Nimbkar Agricultural Research Institute (NARI) > Tambmal, Phaltan-Lonand Road > P.O.Box 44 > Phaltan-415523, Maharashtra, India > Ph:91-2166-222396/220945 > e-mail:[email protected] > [email protected] > > http://www.nariphaltan.org > > -- Nimbkar Agricultural Research Institute (NARI) Tambmal, Phaltan-Lonand Road P.O.Box 44 Phaltan-415523, Maharashtra, India Ph:91-2166-222396/220945 e-mail:[email protected] [email protected] http://www.nariphaltan.org
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