Calcined Clay is a baked clay that does a great job at holding water so that your Bonsai won’t dry out throughout the day and also acts as an acidifier. Calcined Clay is the American version of the Japanese Akadama. Particle size is 1/8" on average.
 

-2 Quart Bag

Reference: 8 cups per bag. 

- 24 Pound Bag

Covers about 1 cubic foot. 

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