Perlite #3, 4 cu.ft. bagPerlite #3 Perlite is a lightweight 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. Perlite has a neutral pH, is sterile, and can also be used alone as a medium for hydroponics or for starting cuttings. Perlite #3 features large coarse particles which maximize nutrient uptake, drainage, aeration, and help prevent water rot at the root