If you keep seeing them, I'd fish one out to check. When I first started asacol I was pooping to often and they were coming out whole (I fished one out of the toilet and it was full of wet white mushy powder). Luckily the enemas started working pretty quickly, slowing my transit time down and giving the asacol more time. Um, long story short, don't assume it's just the shell, get in there and check to be sure