Looking for the air cleaning bucket.

I seen a thread on here somewhere a DIY bucket with a fan mounted on the top of it. The inside of the bucket contained water and a chemical fragrance solution of some sort.
I searched the forums but came up with nothing and was wondering if anyone knew what the chemical solution was and where to get it?

You want ONA, that's the odor absorbing chemical. Comes in gel, liquid and block and available online or at hydro shops. You want the liquid. You need slow-release water absorbing crystals or beads, which will allow the ONA to last longer. I found mine at a gardening center. Install powerful fan on top of bucket blowing outward and drill several passive intake holes around the bottom of the bucket. Pretty much that's it. Good luck.

Thanx ONA it is.