I bought a WLP California ale yeast and it exploded like a shaken soda can when I opened it. It was all over my kitchen basically. I pitched what I could ( mostly foam ) into my well aerated wort last night but there is zero activity. I'm just going to buy a smack pack of American Ale today. It was my first and last time using the vial. I'm done with WLP vials. It was the worst brewing experience ever.