Perlite for agricultural use – 100 liters, with neutral pH. It is a natural, alumino-silicate mineral, which provides aeration and moisture retention to crops. It contains 3 to 4% crystalline water and has volcanic origin. It is mechanically processed, without chemical additives, by being heated to 1000 oC, a temperature at which it expands. It has granules with a diameter of 0.63 to 4 millimeters and is produced exclusively for use in agricultural applications.