Pervious concretes like Osmocrete are manufactured using controlled amounts of water and cementious materials to create a paste that forms a coating around the aggregate particles.  However, unlike most pervious concrete which utilize Portland cement, Osmocrete employs an award-winning ceramic cement which increases mechanical strength while reducing the amount of cementious material required to coat and bind the aggregate.

Typically pervious concrete mixtures  like Osmocrete contain  little or no sand which creates significant void content which is highly permeable to water. 

In fact, permeable concretes typically have between 15% and 25% voids and  water flow rates around 480 in./hr (0.34 cm/s, which is 5 gal/ft²/ min or 200 L/m²/min).