Can salt treat fin rot and other bacterial infections?

yes, it can be used to treat fin rot with no side effects. It is effective and far safer than chemical treatments. However, there is no guarantee that it will cure your fish's fin rot.

No, it can't cure it, but it can help your fish get through it.

Fungus and fin rot are usually secondary infections brought on by stress which is caused by other diseases or poor water quality.

Best medicine for fin rot and fungus is fresh water. Constant water changes with 0 readings on ammonia, nitrites and very low nitrates, and a little salt to help ease the stress.

You can also treat with a fungicide, but I've always had good results with constant fresh water.

Roan