If your sure its ich you have a couple choices. Treat the fish with hyposalinity or copper. You could remove your fish from the tank and leave the tank fishless for 30 days. This will not treat your fish but it will kill the ich in the tank.
Forget the sterilizer. What type of tank do you have? Take a look at the Thread at the top of this forum which details suggestions about How To Post In The Disease Forum. We need that info to make educated suggestions.