I am not sure if I did it right or not but when I cure my dead rocks with acid, I put my rocks in a 5g bucket, I then add 3/4 tap water to the 5g, then I add 1/4 murriatic acid to the bucket. I let it sit in there for a whole day, next day I drain it down, wash each rock with a jet stream of water, then I put the rocks into a clean 5g bucket and fill it up with tap water let it sit for a few days, take it out and rinse it then let it air dry, when rocks are dried, I add it tk my tank.