This seems like a reasonable enough request to ask of your housemates…except for the fact that, as Jason explains, “Our water is full of assorted minerals (and who knows what else), and drips from the ceiling above the bathtub all day.”
So those yellow stains in the tub? Yeah, not urine. Just evidence of a bathtub in need of some serious scrubbing. (And those pink stains on the water cooler? Probably not lipstick.)
But if your shower smells like piss…well, it’s gonna be hard to blame that on hard water.
related: Who takes a crap in the shower?!