Question about cycling rock

[Aquattro]

Originally Posted by Oilers

Brad,
I have about 150 lbs of rock in the tank, would a 5 lbs piece be releasing significant phosphate that would be a problem??

I don't know either way, but i wouldn't want to find out. If it was a piece of rock that I just couldn't throw in the garden, I'd probably boil the crap out of it then soak it in RO for a while.