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Dinoflagellates might survive in spore form even if the rocks are dry. A vinegar dip likely will kill them. I might try a 50:50 mix, and let them sit with some circulation for 30 minutes or so. Bleach would be cheaper for killing dinoflagellates, though.
For treating rock for mineral deposits like phosphates, I'd add 1 part muriatic acid to 10 parts water, and let the mix sit for 20-30 minutes, but muriatic acid requires careful handling, as indicated.
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Jonathan Bertoni
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