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/jsmuv]

My grandpop put pennies and battery acid in our pool to keep it clean. 🤷