Zeolite - a family of hydrated aluminosilicate minerals that contain alkali and alkaline-earth metals. The zeolites are noted for their lability toward ion-exchange and reversible dehydration. Helping the soil retain moisture and prevent run-off. Zeolite’s ability to retain moisture is another positive aspect for using Zeolite as a soil amendment. Zeolites are great for aeration as they can hold up to 60% of their weight in water due to the high porosity of their crystalline structure.