eli5: Why does hard water leave rings in toilet bowl but not in tank?
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Personally haven’t observed this but the tank is more sealed than the bowl hence there would be less evaporation. Less evaporation, less salt deposits.
The hard water reacts with urine, causing the precipitation of the salts.
I don’t know whether the salt deposits are just limescale from the water or a compound formed from a reaction between the urine and the limescale. They’re more resistant to acidic descaling solutions (HCl, etc) than plain limescale. These deposits can completely block the drain pipes from urinals.
Waterless urinals are available and save on both water and cleaning costs; they’re also less smelly.
The tank gets pretty nasty in there too. Tho I am from a part of cali where the water tastes like coins, comes out brown, blackish at times and has a strong rotten egg smell
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