This 3-gallon aeration frame provides proper oxygen levels in the root system and helps facilitate nutrient uptake. The 724890 RediRoots aeration frame is a heavy duty plastic frame with engineered air entry points to introduce oxygen to the root zone. It also provides air pruning of the roots, giving you strong lateral root growth, while reducing thin spiraling roots. This RediRoot aeration frame incorporates legs at the bottom of the frame to provide air flow under the container. This keeps mold and pathogens from forming at the bottom of the container from overwatering. The RediRoots aeration frame 724890 can be used as a standalone container or used with RediRoot cloth liner.