I think I have a problem that I need some help with. After I have put my mash through the still I have a bit of gunk that comes in with it, although not every time. I filter through my carbon and in the end there is like a mucussy type stuff left in it. I have tried re-filtering through coffee filters but it seems to GROW back again. Has anyone heard of this problem or does anyone know a fix. I am at my wittsend.