Some people soak it in bleach and water, and then somehow remove the bleach from the wood. Some people put it in the oven to heat it up and kill off parasites and bacteria, some people boil it. The easiest way in my opinion is just to put it out in the sun to dry out. The idea behind making it "aquarium safe" is to remove parasites and harmful bacteria so they don't leach out of the wood and in to your tank and harm your fish. By putting it out in the Sun it naturally dries out the wood and the UV rays help kill bacteria making it very close to impossible for any bacteria or parasites to live in the wood. This is what I did to my wood, I just left it out in the Sun until it was bone dry (it was already pretty dry). Then I sprayed it all down with the hose and scrubbed it with a Clean and coarse brush. Mainly to remove dirt and dead outer layers of wood that could cloud your tank. The only downside is the wood is going to be very buoyant and hard to keep down, but there is always a way to make it work. I just have mine pinned underneath my filters and the front of my tank so it can't float to the top. I have had zero problems with parasites or anything and my fish are happier than ever since I put my wood in. Hope I could be of help! You can check out some of my tank shots in my previous threads.
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