27th February 2015 at 8:34 pm #876
Hi Lena
I can forward you a document about filters used in Nepal that were made from plastic. I don\’t believe that it makes any difference to the bacteriological efficiency, although if the sides are smooth there may be short-circuiting but I think that is an unproved theory as yet. In any case, you can always roughen the inner walls if needed to be sure.
Email me at ericfewster @ bushproof.com if you would like this info.
Cheers
Eric