3 Gallons Large Particle Size Inorganic Soil Mix for Long Lasting Bonsai Soil - Pumice, Turface Lava. 33% - 1/2" - 1/4" Natural Cascade Mountain Volcanic Lava rock. Pleasing mix of red, grey, black and white. 33% - 3/8" - 1/4" Natural Cascade Mountain Volcanic Pumice. 33% - Large Particle Size Turface. Turface is a high fired Calcined Clay. Particle size is 1/4 inch to 1/2 inch. This is the same Turface product designed and used on The International Space Station. 3 Gallons volume. Will fill 6 trade gallons. Doesn't rot, all natural, relatively light weight. Our potting mix is hand packed and bagged with a reusable tie for easy storage after you have used part of the bag. If your potting mix dries before using, moisten it to keep dust from forming. Dust from any rock or potting soil product should not be inhaled and can be irritating for people with sensitive lungs. Ships UPS or USPS We are a commercial Wholesale / Retail Plant Nursery with over 30 years mixing specialty potting mixes. Check out our other listings of custom potting mixes to select the perfect mix for your bonsai or specialty plants. Use this soil mix as is, or add in your favorite locally available compost or organic matter to make the perfect soil. Scenic Hill Farm is a licensed Oregon nursery -- license # L0170090NG