List. Cc Dale I think Dale knows a lot on this topic. Dale?
Ron On Feb 13, 2013, at 8:23 PM, 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/ >
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