Cob: Metal Roofing

[Mike]

SOme have used sand and rock filter. Not sure if I ever saw it on the web.
Another filter is called big berky about 1/2cent per gallon cost. will
filter nile river water. enough said on that one. If near mid western states
you might want to get sample taken to county ext service.

Thomas jefferson used his rain water and put brick ditch aound house with a
good roof over hang. that then let water to go to cistern. maybe there could
be a way to filter water with sand rock at bottom.