Too often KORR customers lament, “I feel so guilty throwing away those bulky MetaBreathers!” The truth is, the tubing portion of MetaBreathers is made of a high-density polyethylene. That is the same substance as plastic milk cartons. So if your community recycles milk cartons…you guessed it! MetaBreather tubes can be recycled! Â And if your community doesn’t recycle, contact KORR and we will send you a mailing label to return your used MetaBreathers to us for recycling. We can work together to provide clean test equipment for our patients AND a clean environment for our children!