Yes, using non-iodized salt is a time-tested standby, it's been around much longer than commercial fish medications and IMO is even more effective and safer in many instances, ich being a perfect example.
1/2 tsp is a VERY small dose- the most common dose is 1 tbsp per gallon. You can use even more than that if you just do a short "dip"- I tend to think dips are on the stressful side for fish, however. They're most commonly used with large koi, since it's hard to keep a large enough QT tank handy for long-term treatments.
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