Recycled HDPE granules are produced by collecting used plastic products, such as plastic bottles and containers, and then sorting, cleaning, and processing them into small, uniform pellets. This is done using specialized machinery that shreds the plastic products into small pieces, washes them to remove any contaminants, and then melts them down and extrudes them into pellets. These pellets can then be used as a raw material in the manufacturing of various plastic products.