I don't. I maybe do a refresh of about 20% every 6 months but that hardly counts as a water change.
When I do it I have two extra large rubbermaid containers, I fill one with DI water (don't have an RO unit but I do have a tester and the tap water here is like <100 TDS anyway) and mix the salt with a heater until it's tank temperature. I siphon a full amount's worth into the empty 2nd container and then use a small Quietone 1000 to pump the fresh mix into the tank. It's fast enough and can do a large volume without disturbing the animals or wrecking your back having to lift anything.
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