Thanks EMP, this is something new to me.
From reading in the SODIS links you supplied it seems they suggest getting the water above 50°C to deal any amoebic dysentery (if present).
50°C = 122°F and while this is lower than pasteurization it is not that much lower. So thanks for the tip about making a WAPI
I assume amoebas would generally be present if there was fecal contamination, or am I wrong about that?
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May set off to explore without any sense of direction or how to return.