PondMAX Black Waterfall Foam Landscape Filler / Adhesive is a black colored foam formulated to retain its dispensed color and blend naturally into the surrounding landscape, even when exposed to direct sunlight. It bonds quickly to porous or non-porous rock, stone, cement, wood and cloth and is ideal for replacing loose mortar in rock walls. Waterfall foam can also be used to direct water flow in pond or waterfall applications and it’s safe for use around fish or plants.