Fill the litter box with a layer of product 5-cm deep at least. At least once a day, when you remove faeces, mix the litter using a suitable scoop. The product will be 100% efficient and last longer. Do not worry if the grains change colour since their absorption capacity is not affected. Replace product only when it is fully saturated and starts smelling bad. Silicon sand is an inert material so it must not be dumped in a flush toilet but disposed of as household waste.