What is a portafilter?
A portafilter attaches to an espresso machine, and carries a tamped puck of coffee with its coffee basket. It is usually made of brass, and also includes a plastic or wooden handle. The portafilter forms a seal with the espresso machine’s gasket, and directs high-pressure hot water through the coffee puck. – Wikipedia
Portaflon is a coating like teflon. This portafilter, coated in portaflon, there will be no metallic taste to coffee nor will you accumulate as much sediment.
I look forward to seeing one of these babies in action!