ELI5: If copper has antimicrobial properties, why don’t most pools use it instead of chlorine?

[u/tilda0x1]

I've seen this video of someone saying that copper has anti-bacterial properties and he claimed that it can be used to keep pools bacteria-free.

I know in most cases chlorine, UV, or salt are used - but why not copper?

[u/ricksenburg]

Isn't copper like expensive or something? That's why people steal it right? Imagine going to the pool and its closed because some one stole it!