Originally Posted by Beer_Pirate
My biggest concern with using plastic for fermentation is if over time the beer smell kind of soaks into the plastic, and then forces its "aroma" onto subsequent batches.
have you guys had any problem with this?
Not even a little bit. If that's happening to you, you need to step up your cleaning process. With PET, nothing should be left behind. Don't use a brush, which can scratch the plastic. Soak it overnight in oxiclean free or PBW, then rinse the hell out of it. For my Better Bottles, I also treat them to a heavy spray down in my jet bottle washer. Afterwords, they look and smell brand new.
For the "Why use a conical?" questions, it's simple. They look awesome, they allow you to take SG readings without risk of contaminating the beer, they allow you to rack without an siphon, and they allow you to dump the yeast cake out of the bottom, turning your primary fermenter into a secondary fermenter without having to move the beer. They're also available in stainless steel, which is easier to clean, and will outlive your grandkids. Also, they look even awesomer.
For me, when (not if) I make the move to conicals, they'll be big enough to handle 10 gallon batches. The added expense for a 5 gallon batch just doesn't make sense to my wallet.