I think I found a bug with the Liquid Germ Sensors in the Spaced Out DLC. Attached are pictures of my typical set up for a auto germ killer with backup storage, but for some reason the water is coming out with 0 germs even though its sitting at about 400 in the tank. Normally what happens is the water will pass the sensor, see it's above 0 germs and reroute to the end of the line to keep killing germs. However, the sensor is constantly reading 0, and dumping on the other end at 0.
I can't seems to make it work the way it's intended, so just building the same setup should make it do the same thing.