Bro, I did the following. Not sure if it's the correct way but it's some methods I derive from reading the forum.
Scrub the rocks
Pour household vinegar. I'm sure it disinfect the rocks to a certain extent but more important, I want to check out whether it fizzle. I've tried vinegar on various rocks, some really fizzle and sizzle. That should give you a gauge of whether the rocks are suitable .
Then I pour boiling water and soak it.
I let it cool first before handling. I've scalp my fingers before due to being over excited in handling the rocks. Haha.
You can choose to scrub the rocks again but I lazy. 1 scrubbing and one hot water treatment for the rocks is enough for me. Then after that, it's the fun part of placing the rocks.
Enjoy.
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