Limescale can build up wherever there’s hard water. I know, I know, you’re looking to prevent It, not understand how it got there in the first place. I’ll ditch the history lesson so you can get right to It.
I can stay underwater for up to 10 minutes! My favourite thing to do down there is count to 10 minutes. That’s 600 seconds. But I normally get bored and just come up after 30 seconds or so. Counting to 600 is way overrated.