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					Originally Posted by  don.ald
					 
				 
				So, when you remove rock from your system do you cook it and replace or do you purchase new "fresh" rock to replace? 
			
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 When I remove rock, it goes in the garden. My line of thought is that rock in a closed system has a finite lifespan. To alleviate this somewhat, I regularly turkey baste the exposed rock to clear the pores. 
At the 3 year mark of my tank, 90% of my rock has been replaced. NO3 and PO4 still 0. I have never had measurable amounts of either. Based on that, I'm going to stick to my ideas on old rock 
