This product is designed to improve soil drainage in your garden or landscape. It helps to reduce waterlogging and improve the overall health of your plants by allowing excess water to drain away from the roots. It also helps to reduce the risk of root rot and other soil-borne diseases. The
From Wikipedia
Drainage is the natural or artificial removal of a surface's water and sub-surface water from an area with excess water. The internal drainage of most agricultural soils can prevent severe waterlogging, but many soils need artificial drainage to improve production or to manage water supplies.