Hi all, has been a couple of years since I posted. I am setting up my aquarium again as I now have the space and time for it. When I took my system apart I put my canister filter in the shed and didn't empty the water from it, silly I know. Would the biological media be ruined or can I rejuvinate it by soaking in a bleech and water mix or maybe wash very well. I don't know if this water has become toxic and absorbed any poisons from being stored like this for so long. Any advice would be appreciated.