How to support a wounded goldfish?

My little sisters goldfish got sucked up by the filter. I'm g uessing he has b een there while she be in school.Now it seems as though he can't move he's basically floating around and leaning and stuff. Is there any possible way that he can alleviate or a waay we can help him. If not what should we do?
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Answers:    You should sprinkle some salt in his cistern to heal his wounds, but not too much. One teaspoon per 10 gallons. Keep him under close surveillance, with feed him. If he is not swimming around, you should go to your pet store, and ask if they have treatment.
2 questions_________?
MAKE SURE ITS AQUARIUM SALT
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