I’ve been scouring the Internet trying to find the best solution for my own operation, and I stumbled upon this and I’ve made a phone call to the manufacturer to find out what kind of HDPE it is made out of, I haven’t heard back yet but I’m going to call in the morning to follow up. It’s not cheap but it would definitely make for emptying buckets a breeze. https://totetopmegafunnel.com