Only 2 have existing hydro systems and seem to be doing well. The others are just starting, trying to figure out what system will work best for them. We will be going over the 6 types and all the pro's and con's of each on the next meeting. I think a few were farmers and are looking for a better way to garden in their golden years.
They mostly had questions about the upkeep,
nutrients and pH but I expect more since they know a little bit more and should be slightly more comfortable with the surroundings now.
Here is a pict of me doing my thing...