Martens Brewery in Belgium, which I've had a good look round (before I started any serious brewing, but I've still not got that serious!) Purges his bottles with CO2 (recovered from fermentation), then fills under pressure, another jet of CO2 and then a small blast of SO2. All into PET which he inflates and coats himself. Claims to be the first commercial to bottle into PET and the only to blow beer-ready PET, which he sells to a couple of other breweries.
Fantastic place to look round, brand new plant, continuous flow mash which runs all day to give a day's fermenting run, all pipework and cleaning lines permanently in place, as well as lines for accepting tankers in for other breweries bottling into PET. Claims a 2:1 water efficiency for the entire plant, including cooling etc.