Bonsai Jack 1/4 inch Horticultural Pumice Soil Amendment for Cactus and Bonsai, 3.5 Gallons The cleanest and safest bonsai soil additive guaranteed. The cleanest bonsai aggregate available. Pre-washed. Consistent sizes, ready to use, no sifting required. No fillers or artificial coloring Available in 2 Quart, 1 Gallon, 2 Gallon, 3.5 Gallon, 7 Gallon, 14 Gallon and 28 Gallon SKUs