Filtration??? Quizzically, Bob What's wrong with Fitration, Bob? Do you prefer "filter" bacteria or "the bacteria residing in the filter material"? I did'nt now that I had to be an expert in English grammer to post here! Sorry for the mistake, I'll try to be more careful next time... regards Stephan Malta --- StripMime Report -- processed MIME parts --- multipart/alternative text/html ---