For new, out of the bag gravel, you should not need boiling or even hot water for rinsing. There are no disease issues, you just need to remove any dust or dirt from the bag, especially quartz dust.
Use a container (or bucket for larger amounts) and rinse with a faucet or hose, stirring until runoff is clear. Do not do this over a garbage disposal!
Always use caution with very hot or boiling water, it may damage coatings on some colored or glossy gravels, and may cause some to burst. Do not put hot gravel into a tank or bowl.
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