What? How would that even work? The nozzle gets dirty and the bacteria propagate three feet up the tube against occasional water flow and into the main pipe?
I’d imagine something like a guest bathroom that is rarely used so the bacteria have time to multiply and diffuse up the water pipe. Or develop a biofilm on the pipe walls that isn’t removed by running water (to see this effect leave a dish of water out for a few days so it feels slimy then try to rinse it with water)
I don’t think this is likely at all, but I could understand how it could come about in some niche situations.
What? How would that even work? The nozzle gets dirty and the bacteria propagate three feet up the tube against occasional water flow and into the main pipe?
You can have pressure loss in the while system and it can suck water up it and contaminate a lot of fresh water.
I’d imagine something like a guest bathroom that is rarely used so the bacteria have time to multiply and diffuse up the water pipe. Or develop a biofilm on the pipe walls that isn’t removed by running water (to see this effect leave a dish of water out for a few days so it feels slimy then try to rinse it with water)
I don’t think this is likely at all, but I could understand how it could come about in some niche situations.