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I think you'll find that the powerhead might blow off some of the junk but the bulk of it will be washed away with a lot of rinsing. I never bothered with a heater because I soaked mine inside a heated basement where the air temp was probably 70 degrees. If you were doing this outside or in an unheated space where the temps are cold, a heater will likely loosen the debris faster.
soak...scrub....rinse....repeat
You'll likely be surprised how fast you can get these ready for your tank. I know a lot of people spend months to reach a point where they feel that the rocks are safe but I've never had to wait that long.
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