I am looking at getting a emperor 400 filter in the next couple of months. I have been reading on differnet sites about people using a homemade/make our own filter media in these. i really dont want to spend 40 dollars every six month for filters when i know there is a cheaper way out there for filters. so if anybody can help please put ur input in. fo thows who do make there own filters please list what u use and were u got the parts to make the media