Guatemala customer feedback to waste plastic to oil pyrolysis plant

The Guatemala customer is a German gentleman with strict requirements, he bought 2 sets 10T/D waste plastic  to oil pyrolysis plants from us and installed in Guatemala in 2015. Now these 2 machines are still running well, and we got a few feedbacks from the customer recently.
He said that the oil output from his pyrolysis plant is about 65-75%, and carbon black is about 10-15%. He is very satisfied with this result, and told us that he would buy more machines from us. Below are some chatting records between us, please check for reference.