For artificial grass, you will need a fine-grained sand. This type of sand is often called kiln-dried sand, and it is specifically designed for use with artificial grass. Fine-grained sand is used to help weigh down the grass and provide a stable base for it to sit on. It is important to use the correct type of sand for artificial grass, as other types of sand may not provide the necessary support and can cause the grass to shift or become uneven. When purchasing sand for your artificial grass, be sure to specify that you need kiln-dried sand specifically for use with artificial grass.