I don't do hot tubs. For something like every 5 people who uses it, gives you around a tablespoon of shit in the water. Now at least in the hot tub there is chlorine that will deal with this. In the bath there is nothing to deal with this. I don't want to sit in other peoples shit. It's not about people having a shit in the tub, it's about no matter how much you wipe, particles remain. These mount up.
Then sperm - someone said oh but my dh doesn't wank in the bath. Like us ladies, the men also release fluids. And don't forget after sex, unless he goes and washes his nob instantly, both your juices are still on his dick nicely dried in.
Urine, both sexes have urine on them, unless of course they wash properly after every single time they go pee. There's also something that happens when you get into the water and a small amount of urine is released. Something about the change in the temperature.. A bath cannot deal with this. It has nowhere to go and there is no chlorine to deal with this.
I do swim in some pools. If I go and the smell of chlorine is strong I don't swim.
And I don't share baths. Shit, piss, spunk, debris from hair wash, sweat, dead skin and anything else. As part of my cleansing ritual, I am washing away all of this, and this needs clean water.
Put it this way. You wash up. You don't fill up the sink with water and then wash everything from the entire day without changing the water and rinsing, do you? You don't run the waste water from the washing machine into a bucket to use to wash the next load.. Instead you use clean water. Why does the dishes and clothes get nice clean water and you don't?