Recycled pallets are a good, cheap source of untreated lumber.
Tie three together and you have a bin.

Phisherman wrote:

PT wood is just plain nasty to work with. And there's certainly
*some* arsenic that would leach into your compost. How much? Who
knows without a quantitative lab test? But by using other materials
(wire fencing, plastic, etc) your compost will certainly have LESS
arsenic in it. Regular lumber would be fine, although it may only
last a few years unless you used cypress, cedar, white oak, or
redwood.

On Mon, 28 Apr 2003 11:27:08 GMT, Beth Pierce
wrote:

I am reading Storey Publication No. A-139 on composters. It
states you can use treated lumber for composting bins.
Knowing you can't use it for raised beds, I'd like to know
why it can be used for one thing and not the other. Is it
because compost is a "second stage" material, ready to break
down again in the soil and soil for raised beds is not?