My compost bin is pressure treated.

[Laurel leaf]

I built a compost bin a year ago. I used pressure treated deck boards on the exterior. I read an article that said to avoid using pt lumber. I also read that the concerns regarding pt lumber have been address and the issues are not the same anymore. What do you think? Should I remove all the exterior lumber and replace it? Can I use plywood on the inside for a barrier between the compost and the wall?

[rainbowgardener]

Personally, I wouldn't worry about it. P-T wood used to have arsenic in it, but that was years ago. The treating chemicals are less toxic these days. I wouldn't try to put a barrier in, because any barrier you use will cut down air circulation through your pile, but air circulation is what you want.