BRS Reef Saver

I want to add some rock to my already established tank and was thinking about buying some reef saver rock from BRS. My plan was to get the rock, let is soak in freshwater overnight and then slowly add the pieces into my tank. My tank is 150 gallons so I am assuming that the damages, if any, wouldn't be as drastic since I'm slowly adding the rock and since my tank is fairly large. Does this sound like a good idea?