The PL Calcium Substrate Sand, available in a 25Kg package under the product code AG25, is a specially formulated sand designed to enrich aquarium environments. It's high in calcium content, making it ideal for promoting healthy growth in corals and other calcium-dependent aquatic life. This substrate not only stabilises pH levels in marine and reef aquariums but also provides a natural and aesthetically pleasing base layer, enhancing the overall appearance of the tank.