Why dry Clay mask ? 
There is SOOO many good options to mix clay masks with that can’t be premixed due to spoiling such as yogurt, milk, eggs, avocado, honey just to name a few. 
This way you can mix with what you desire what you need and storage the dry Clay mix for next use safely without spoiling

Charcoal:
Acne, Plugged Pores, Detoxing 
Cleansing 
activated charcoal can absorb toxins in your body, some beauty experts believe that a charcoal face mask can help draw impurities and dirt from your skin. Reduces acne breakouts. 

This pouch makes 8-10 masks