Choose items to buy together. This item: 3 Gallon Bag Garden Pumice (3/16" Stone) 13lbs. $28.99. In Stock. Ships from and sold by General Pumice Products, LLC. FREE Shipping. Horticultural Charcoal, All Natural Hardwood Charcoal, Charcoal for Soil Amendment, Orchids, Terrariums, and Gardening (1qt) $9.99. In Stock.