“Is saltwater good for an eye infection?”

Please DO NOT USE SALTWATER, especially if it is home-made. You should have your "infection" analyzed by a doctor or an eye doctor ASAP. Eye infections can include conjunctivitis problems of which there are many, scratched corneas which can "mimic" an infection, styes, or other more serious internal eye problems which create a red eye problem. Please do not "self-medicate" or "self treat" yourself because this can sometimes lead to bigger problems. See a doctor, please. Good luck and best wishes

probably not
it depends on what type of eye infection you have

Sodium chloride drops such as Muro 128 help with corneal edema