My Corid powder clumped up after getting slightly moist; is it still effective?

Hey, guys! I just got 24 new chicks, and they seem to have a case of Cocci, though not terribly severe. In an attempt to respond to the excessive intestinal lining in their stool, I've been giving them Corid in the water, but this brings up a rather silly question: last time I used it was summer of last year, when our middle-aged chicks caught it, and I must have gotten a little moisture in the package, because it clumped up into hard chunks. Is it still just as suitable for combating Cocci? If it's not, what I really need is to stop by Rural King and pick up more so that my chicks don't get worse.

Thanks!
-Alex

 

Thanks, @GitaBooks ! Just what I need to know. It's probably a silly question, but I simply want my beloved babies to be safe.

-Alex

 

You are so kind! Thank you for the encouraging words; they mean a lot.

-Alex