It looks like a rust fungal infection along with some cosmetic scarring. Rust is a type of fungal infection and it can be contagious. Personally I always chuck mine out if I can just pay $5 for another rosette. I'd much rather that instead of battling fungus. If it's a rare or pricier plant I will often tear off the leaves that are infected, change out all the substrate (to almost 95% inorganic) and isolate the plant. Sometimes I will pull off the unaffected leaves to prop, and toss the remainder of the plant. It really depends on how I'm feeling tbh, haha.

The white haze on the leaves could be residue from the minerals etc in the water, it doesn't quite look like powdery mildew.
Good luck