Not true. Swim bladder needs at least 10days treatment and I cannot stress that enough. I have seen so many members come on and say "I treated for SBD, he started swimming again so I stopped. Now he's not swimming again." and most go on about having to use Epsom salts permanently. No, do the treatment for the 10 days minimum and then wean from the salt (half a gal of fresh water day one, full fresh water day 2). I promise you, you will only have to do treatments over and over. Even though he's swimming ok now, he may go belly up on you again in a day or two. Stick it out until the weekend, it won't hurt him.
My Hughie was so bad with SBD that he was upside down in his cup at the store, unable to do much of anything. I didn't think he would survive. I had to do two rounds of 10 day treatment on him to stop the SBD, it was horrible lol Anyways, months later he's now a happy swimming boy with no more SBD issues.
Live food helps too, I only fed brine shrimp (or frozen) the whole time he was in treatment.