I always reuse sand.
Wash it thoroughly...like really thoroughly.
Put it in a big rubbermaid, stick a hose in and stir stir stir until the water runs clear.
Once that's done, let it sit in some RO water for a day with some chemiclean or GFO, stir, dump water, rinse once more with RO.
Lots of effort for not a lot of savings but if you are so inclined, you don't need to buy new sand.
Never used bleach, I don't see why it wouldn't work if rinsed very, very well.
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Red Sea Minimum
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