Pumice

BuildASoil Pumice Horticultural Grade: Very porous for holding air. Approximately 50% will float and 50% will sink which is ideal for soil building. Some pumice mines are also full of obsidian which is what perlite is made from and 100% will sink and not add the same air holding properties. When making potting soil, insist on horticultural grade. Last Longer Than Perlite & Has More Minerals!  This is the BuildASoil Way! Pumice makes soil that lasts forever and is more sustainable than throwing your potting soil away after each use. Our 3/8" x 1/4" Pumice is perfect for potting soil. Optimizes drainage Excellent for Living Organic Soil and also for Bonsai Retains and evenly distributes moisture and nutrients Promotes strong root growth Improves root aeration Low Heavy Metals - Used in beauty products also Does not contain clay or organic material (i.e. montmorillonite, illite, kaolinite) Minimizes root diseases Clean from disease or weed seeds and environmentally friendly What