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There should be directions on the bucket of salt. I use Instant Ocean, which says 1/2 cup per gallon, but it takes me a little more. Usually I end up putting in a good 3 cups per 5 gal. bucket to get the salinity high enough.
Let new water mix for at least eight hours before using, and re-test with the hydrometer just before use. If the hydrometer reads 1.021 just after mixing, it will be 1.023 tomorrow!