All

Wood chips, sand, and hay is all I've seen mixed in. I hate the wood chips because they're slick and the slivers migrate everywhere. Hay is slick when wet too, and can get caught up in sprockets and cause problems. It takes a lot of sand to work, and that does change the nature of the track, but I like that better than hay and wood chips. I've never seen pulp sludge, just smelled it. I'll pass!

There’s a great track up in Albany, Oregon…there’s a mill across the road…at least there was back when I raced there… That mill smelled like ASS! 🤣 Based on that…IF there’s a way to treat that pulp excrement and then mix it in some of the dirt you've got…and then PROVE TO YOURSELF that the “Stank Ass” is gone… Then, and only then, I’d say,”Maybe”. Now, all joking aside: I’m kinda stoked to see someone being so resourceful on the matter of making a better track. Good Luck!