TechniSoil EkoFlo Permeable Pebble Binder (16-ounce bottle) Works best mixed with 1/8" - 1/2" clean, dry, washed pebbles or aggregates Permeability allows for water, air & nutrient transfer around shrub & tree planters Recommended 1.5" depth of blended material installs easily on standard hardscape sub-base for walkways, patios and light to moderate weight load-bearing areas Freeze/Thaw Resistance Eco-Friendly