I just posted the same msg on ECHorskeeping. Does anyone know the shelf life for these?  Left a msg with the co. and waiting.  The bag I purchased is from Nov. but it's been in an airtight bin.  Unfortunately, it had been opened.  The person here in my area who sells it said the shelf life is 3 mo.s. and not to use it & takes 2 weeks to order.  I live in Houston area - perhaps someone has a resource?

Thanks,

Carol, Aristotle in TX
August 2013
http://pets.groups.yahoo.com/group/echistory7/files/cjjtexas/