4 cuft bags. Perlite is a lightweight, organic soil amendment that can be used to improve drainage and aeration in potting mixes. Perlite encourages strong root development by helping to prevent soil compaction and water retention. Perlite has a neutral pH and it is sterile and weed-free. Use it in your garden, soil mixes, to create your soil for square foot gardening and raised beds and even hydroponics. Can be used in place of vermiculite. Home depot sells this for $40. Text preferred 801-458-0751