Saw this on steam, just passing by, haven't read any replies of this topic, sorry if repeat thoughts.
My Input:
1. Make Tanks large "Junctions". They need to be calculated individually anyways, this would make it more integrated

2. Leave the float, but make an in game device that "purges" fluid to ...

I have the same problem. Drop down does nothing on one computer but works on the other. In my case though I need it on the computer that it isn't working. It is a 64bit computer and all opt betas on other games are working.