You may have seen on YouTube, various videos that come out of I think Pakistan of various "human powered" factories -- in many of them, they are recycling plastics into new products (I won't get into any of the safety [total lack of] or child labor exploitation aspects of this ...).

In one particular video they were shredding all kinds of waste plastic (again, not even a dust mask) and melting it to extrude into thin strings that were then cooled and chopped up yielding bags of source material for new products.

They were then taking these pellets and making "PVC water pipes" using a home-made looking propane powered extrusion machine. God only knows what kinds of plastic they were using but the pipes looked exactly like the ones you'd find at a Home Depot or similar store. Kudos to the ingenuity of the workers, but wow, I worry about the health implications not just for the workers inhaling the particles and fumes, but the end-users who are now drinking water through pipes made from who knows what plastics.