Abe! thanks for your post/blog. i'm also in the chihuahuan desert. gonna try this bio-filter. a few questions if you don't mind. what do you use for filter material? (looks like straw) what would happen if they were exposed to cold weather? i'm off grid and my trailer isn't heated, was actually thinking about doing this outside. on your blog there are pictures of a steel sink with a filter in it, is that above the biofilter? cheers,
andy
