I've seen it at all hardware stores even walmart

Or my local Rona has it too

Thanks everyone!

Can't you use vinegar, that's what I've done in the past & works great . Safer to handle.
Any advantage to the acid ?

Acid completely removes the outer layer of rock. Recommended bath time is less than 30 mins, depending on your rocks density. If you leave it too long you won't have any rock left.

Vinegar just cleans the surface. So boring.

Just keep in mind that if you buy over $100 of the stuff, they're going to request and take records of an ID. Makes it SUCH A PAIN to hide your tracks after the matter.

You can get the muriatic acid at Rona. I did the same thing to try to cure a phosphate with my LR. Cooked it in Acid, then neutralized the remaining acid/water combo with baking soda. RO soak, then back in the tank. No problems at all. Be warned that you'll want to do this somewhere that can handle a fountain of acidic foam pouring out of your container!

If you're going to do this, be sure to start with your container already holding the required amount of water, then add add the acid to it. Very important that you don't go the other way around.

I'm going to be cleaning a 30G Rubbermaid full of rock...
How much baking soda should I have on hand to neutralize this?

And how do you know when it's done?

Thanks!

The bubbling will be very aggressive at the beginning of the process... as far as “being done” it’s when ur happy with the appearance of the rock or the bubbling (hydrochloride acid being neutralized by the bicarbonate in the rock) slows or nearly stops... I use xtra heavy duty rubber gloves to pull out some pieces and inspect them. Please be very very very careful as the acid will burn ur skin and destroy ur clothes.
I usually put 1/2 a small box in when I’m done. More may be required if the rock was only bathed for a short time.
Remember to do this outside as the fumes are fairly intense
Good luck
VR

Yes safety is paramount. If you do get acid on your skin, neutralize it immediately with baking soda. I'm sure you knew that however.

I always have a few boxes open and ready to go just in case.