I also have a yeast starter issue. I harvested yeast from a previous batch WLP320 (American Hefe), and stored it in my fridge for the last 4/5 months. I didn't use a starter on the initial batch so I'm not sure how this yeast typically responds in a starter.
Ive been doing all starters in a 1.75L juice container, since day one, with no issues. I sanitize the container, and screw the cap on very loosely to allow the CO2 to escape.
Anyways, this Hefe yeast is more active than any yeast I've previously created a starter with. I'm getting blowoff/overflow on my bottle each day. Is this normal? If I simply clean up and let it continue, might this still give me a good enough cell count (of uninfected) yeast for a 5 gallon batch? I'm mostly concerned with infection, but I'd like to stay on schedule to brew this weekend also.
Maverick Moon Miner Brewing