<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Jeff Selle:
I always find rocks in my lump charcoal ... they look like lava rocks </div></BLOCKQUOTE>
I'm fairly sure these are a by product of the process.
I'm not sure how everyone else handles their lump, but these things are VERY easy to notice and pull out. I have a plastic tote I keep my lump in so i'm able to sort and pick any bits out.
Yes there will be the ocassional "lava rock" type thing in the bag... and even some less then fully carbonized wood. That said, it's not prevalent and shouldn't be any reason not to use.