Flushing the toilet when there's nothing in it but differently coloured water is a waste, but I understand why you have to do it in a social context. I would prefer not to needlessly strain my shitty pipes, but I prioritise other people not needing to know that I piss just like they do.
Anyways, this is a very obtuse way of asking how many times does a person have to come to your apartment before you can shamelessly not flush the toilet after (visibly) peeing?
Leaving piss in a toilet bowl will stain it. Challenging you to bleach your toilet and then to leave a bunch of piss in it overnight and see the effect.
Obviously the better you hydrate the less this happens but still
not to mention your bathroom will smell like piss
flush the bleach first or you're gonna give yourself a first-hand WWI experience
I haven't really been able to measure any discoloration shining a light between the level with the water and everything above it. Looks like the same color hex code in a photo too. I've got a septic system and one of those low flow toilets, I flush as little as possible essentially. My piss is basically just off color water but I can piss 5 times before it's like actually yellow. With my fiance traveling atm sometimes I only need to flush once a day when I shit.