Mother Earth Perlite is naturally occurring siliceous rock that when heated to 1600F expands up to 20 times its original volume.

• Sterile and has a neutral pH of 7.0.
• The exceptional physical properties of this perlite make it tops in the perlite world for adding porosity to soil and soilless mixes.
• Perlite has numerous hydroponic applications.
• Coarse is about 1/8 to 1/4 inch.