# Don's Geo Tracker Project - 2- - Charcoal

**URL:** http://forum.driveonwood.com/t/dons-geo-tracker-project-2-charcoal/2439
**Category:** Charcoal Gasification
**Created:** [April 27, 2016, 12:05am UTC](http://forum.driveonwood.com/t/dons-geo-tracker-project-2-charcoal/2439 "2016-04-27T00:05:24Z")
**Posts on this page:** 1
**Showing post:** 318

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### Author: ![bsoutherland](https://avatars.discourse-cdn.com/v2/letter/b/45deac/32.png) [@bsoutherland](http://forum.driveonwood.com/u/bsoutherland)
#### Post date: [October 23, 2017, 1:51am UTC](http://forum.driveonwood.com/t/dons-geo-tracker-project-2-charcoal/2439/318 "2017-10-23T01:51:33Z")

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> [@What kind of filter media?](http://forum.driveonwood.com/t/what-kind-of-filter-media/2325):
>
> 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.

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