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Re: Where to get our water?
In a permaculture class I'd taken we'd learned the same principle, tho I'm not sure I can give it over exactly. Basically it had to do with the way water naturally swirls (spirals) and the structure was like shallow plates (rocks) forming one above another, tho not necessarily in a straight fashion, (more like zig zag) so that the as the water fell down from one to the next, it became cleaner and cleaner. Don't know if it's due to air (oxygen) being added or something else. Perhaps a search on permaculture could add some light. My intuition tells me it's a similar principle that works with waterfalls, but I'm not an expert on it.
Sorry I don't have time to do the research right now, but perhaps next week I'll be seeing my permaculture teacher and I can ask her if there are any references on the web.
Klara
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