My fish recently died due to what I believe was a bad case of columnaris. Treated the tank with meds but to no avail. Now I want to sanitize everything especially my canister filter. Was thinking about throwing some boiling hot water in a bucket and throwing everything in the canister into it like: filters, biomedia, those plastic housing containers and even the impeller. Is this a bad idea? Will the plastic possibly melt and will the boiling water harm the impeller in any way? Anyone have suggestions to sanitize this stuff after a disease outbreak? Either that or I was just gonna bleach everything...suggestions, comments welcome thanks