Pro Rep Ground Walnut 5L Pro Rep Ground Walnut 5L – ProRep Ground Walnut Substrate forms a free-flowing substrate suitable for all types of lizards and snakes originating from arid habitats and is particularly suitable for species that like to hide by burying themselves. It is 100% natural and non-toxic and harvested from a sustainable source. Directions: Spread the substrate evenly over the bottom of the enclosure to a depth of at least 1-2” (2.5-5cm). Spot-clean daily and completely replace every two or three weeks, or more frequently if it becomes heavily soiled or wet. If you are using an under-tank heatmat as your heat source do not use a thick layer of Ground Walnut as this may cause the heatmat to overheat. Please refer to the heatmat manufacturer’s instructions for more information.