Clays are used as soil conditioners in sports grounds and playing fields. Specially prepared clays are applied as a layer under the lawn keeps the water and moisture and give it back to the environment when necessary. It is important to keep the surface of the lawn smooth and easy to maintain as well as for the safety of the players.
Oil-Dri Corporation of America produces "Pro's Choice ®" brand of products for this purpose. Necessary absorption, water retention, and drainage properties and mechanical durability are imparted by correct choice of raw materials, comminution, drying, sorting, re-drying and thermal optimization. Products are mainly colored red, but gray, blue and green varieties are also available.