Hi, I am currently making charoal for a (potable) water filter project iam doing. Today I had but pine wood in a tin can and put aluminium foil in the inside and on top as a lid (with a couple of small holes). Problem was, during the thing the holes in the aluminium caught fire, not a problem so much but eventually the aluminium burnt a massive hole when I wasn't looking at it and the charcoal was set alight for maybe a minute or 2 before I cut the oxygen and put it out. I was making charcoal out of largish chucks of wood. My question is, taking into account that I was using largish chunks of wood, do you think the batch is any good to keep and use as charcoal in a water filter (after being activated) or do you think I should do it again? I had thrown out all the smaller finer parts of charcoal and pieces of aluminium and kept the solid parts. Thanks!