This is made of fiberglass reenforced weed cloth. I glued the seems with Goop Marine Glue and filled it with Perlite. I imaging other media such as compost or Vermiculite could be used instead.
I was able to use the same pump that I pump water into my fish tank to drip water into the top.
The advantage I see in vertical gardening that the produce is within easy reach, less media than a standard grow bed is used, plenty of aeration, easy to manage in sections.
Seeds can be started directly in to sausage, but I had these seedling and used them to get it going.
Nine Days Later
I've made more since first posting this and have been using regular Type 1 silicon. Type 1 silicon is safe for fish.
Nate Storey shared his vertical setup