Silica Sand - Safe for Carnivorous Plants! Need silica sand but can't find any at the hardware store? Perfect grow medium for all sand loving plants This is 1/2 Gallon of silica sand coarse enough to provide drainage without becoming compacted which is important for many carnivorous plants. It also makes an excellent top-dressing to inhibit fungus gnats and help reduce the growth of algae. This sand seems to contain very few impurities, however mineral content can vary from one batch to the next so rinsing with distilled water prior to use is still advisable. The first picture is magnified look at the second picture with the house key for grain size Free Shipping To All US States And Territories