[Stoves] Water Disinfection - Mix Boiling Water and Unheated Water to Pasteurize

[Andrew Heggie]

On Sun, 22 Sep 2019 at 16:14, Anthony Vovers <vovers1 at gmail.com> wrote:

> Thanks for interesting discussion.
>
> Due to inconsistencies in application a boil 3 add 1 recommendation is
> often used.
>
> https://solarcooking.fandom.com/wiki/Boil_3,_Add_1_Method
> Solar stills often have to deal with <boil  situation.
>
> Low cost WAPI's wax indicators can tell you 70C is achieved visually
>

Thanks for that Tony, I too find this interesting and having a means of
indicating the certainty of adequate treatment  would reassure me, who
drinks, bathes and cleans with water supplied by a pipe with guaranteed
levels of hygiene.

We had a  potter who used to contribute, now deceased , his name escapes
me, who made pottery filter jugs which he precipitated a thin late of
silver in as a bactericide

>
>
>
> On Sun, Sep 22, 2019, 06:38 Crispin Pemberton-Pigott <
> crispinpigott at outlook.com> wrote:
>
>> Dear Kevin
>>
>> I like the idea, but the temperature will not be high enough for long
>> enough, or both at 70. Here is a time and temperature chart to guide you
>> (attached).
>>
>
Interesting chart Crispin but it doesn't show what each of those treatments
achieve, or do they all do the same thing to all microbes?

The higher the temperature the more rapidly it will cool. It is fair to
>> assume the lid will be off because of the stirring.
>>
>
Yes the higher the rate of cooling will be but not that it will get cooler
than a less hot vessel in the same time.



>> This site has what saw would call practical advice
>>
>>
>> https://www.offgridweb.com/preparation/survival-science-minimum-water-boiling-time/
>>
>
Yes that seemed sensible

>
>> Neither reference mentions that spores of several diseases are not killed
>> at 100 C including anthrax, tetanus, gangrene and botulism.
>>
>
What temperature does kill anthrax, tetanus and botul;sm spores?

I thought botulism killed by a toxin that stayed in infected meat after
cooking?

Gangrene is more a condition of bad blood flow and I think is often caused
by bacteria we already carry in us which take advantage of the causal
injury. Clostridium Difficule is one such which is normally controlled by
other gut flora but being antibiotic resistant gets away when the benign
gut bacteria are killed off.

Andrew

>
>
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