Just picked up a 2028 from a friend who moved out of state. He left the canister full of stagnant old tank water for months. Would you reuse the bio-media?
Think it will be ok using bleach? I'd be afraid, that even with soaking, I wouldn't thoroughly flush all the bleach out of the material being that it has so many minute chambers. I was just going to do multiple soak/rinse cycles in fresh water.
If you use bleach, it is recommended to rinse thoroughly (obviously), but then let the media soak for 24 hours in in a strong solution of and something like Prime