Don's Geo Tracker Project - 2- - Charcoal

[bsoutherland (Bruce Southerland)]

What kind of filter media?

Probably a dumb question, but what kind of hay or straw is good for the filter? I have near me a source of oat straw. Is that a good choice? Also alfalfa hay or mixed hay seems common around here. Going another direction, what are the qualities of hay that make it good for a filter. I’m thinking of other filter materials that might work good like plastic or something.