I have had great success with this fine, soft, powdery-type substance. It is made from a mixture of elements that are found in natural materials such as limestone, clay, sand and/or shale. When I mix it with water---Shaazaam! It's made up of Calcium, Silicon, Aluminum and Iron and is usually kinda gray. My advice: Keep it stored in a dry area. If it gets wet or damp the powder will turn into a 50lb hard lump!
(Sorry for the sarcasm---- I've been fighting a leaky pond for 8 years now!)
