The PET bottles in the soda aisle have not been filled, emptied and refilled over and over. There are refillable soda bottles in Europe, but they are taken out of circulation after 8-10 uses because they will eventually leak as the PET breaks down.
The Tap-a-Draft system used for what it is...
One-way PET kegs are designed to be filled once. I work in PET packaging, I am very familiar with the Petainer, and this is very dangerous. The PET properties will change as you apply and release pressure over and over. It will eventually fail and potentially maim or kill anyone that happens...
Hello HollywoodMX,
I manage the supply of KeyKegs to North American brewers. I wish I had seen your posting sooner, but I'm glad my colleagues in Europe were able to help.
I have seen quite a few overcarbonated KeyKegs. This can be due to extra fermentable sugars and active yeast...