I recently purchased a bauer K14, runs good with no problems. I do have a question about the filter stacks though. The 2 stacks are about 32 in tall and 5 in dia. There is no tags or markings on them marking what they are. When opened up they seem to have a bulk media in them, one with what looks like a charcoal filter and another that looks like a desiccant. I am only familiar with the cartridge filters, any idea what this is and where I can buy some replacement?