Now that I have found washing soda the size is not a problem. But I will have to give using tap water a try as I do not fancy filtering 30 or so gallons of water. I need to run that experiment with tap water in my little unit from part 1. I wonder if adding borax to the water would help. What happens when you put too much in.
The need for pure water has me thinking about a solar still. But this is January and water in small containers freeze solid. This is also a problem for the tank itself.
Instead of cutting up my one long chunk of rebar I am using some short stuff left over from when they built a highway. It is high quality stuff with a coating of some sorts that I hope can be removed by putting the neg on the rebar and the plus on a lump of junk in the center. The C shape is a bit of 1" strap that I may use near the bottom.