How big is it? I bought 3 pieces that were about a foot big and all i did was boil some water, place them in a 5 gallon bucket and pour the water in. I left it sit for an hour and towards the end i scrubbed them with a brush to knock off all the junk. After that i followed this guideline....boil the peices for 20 min, change the water and boil for 15 min, and finally change the water and boil for 10 min. I didnt use salt or bleach or anything like that and they sunk as soon as i placed them in the tank. I had no signifigant tinge so I just did some extra water changes and never had a problem.