What means are you using to mix? Powerhead, mechanical, by hand? I just use a rectangular rubbermaid type container to mix up my water change. Use a wooden spoon after dumping the salt in & then add an AquaClear powerhead. I let that run for at least a day & by that time it's all good. I try to plan ahead so I don't have to worry about how fast it mixes. Throw in a couple of heaters a few hours before the water change, it's cold in the basement where the container is.
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