Im doing this right now with 15 lbs Brs dry Fiji. It was kind of dirty when I received it, lots of dead stuff. I rinsed it good in RO water, then let it dry for couple days. Got out the air hose, and blasted it in every nook well scrubbing with a stiff tooth brush. Rinsed in RO again, then left it soaking in clean RO for a couple days with two powerheads. Rinsed in RO again, then put in 15g brute with SW from a water change and two good sized pieces of LR that have been in my tank for three years. Started in the SW on 10/15, did some WC of 50% every few days, Along with a couple 100% WC to date. All my levels are zero in just over two weeks, I'm going to let it go for another few weeks as I'm not quite ready for it yet. Oh yeah also had a heater going at 79. Smelled so bad by day 3, I had to add carbon in a bag! I went the air route rather than power washing because I didn't want to add any of my tap water chemicals and metals into this nice rock. Phosphates were high at one point, so I figured it was leeching it out. Good luck it's a blast !