INSTRUCTIONS FOR USE: Sand residue emerges during the transport and it’s perfectly safe for your aquarium, though, in order to avoid water turbidity we strongly advise to rinse the sand in RODI water before use. Pour the contents of both bottles into 3 liters of saltwater, mix thoroughly, add to the sand bag and leave for 24 hours. In order to allow bacteria multiplication, do not close the bag. We do not recommend storage in cool places, as it significantly increases the time of bacterial multiplication. The optimal sand maturation temperature is around 25-28°C (77-82°F). After 24 hours the sand is ready for use in the aquarium. When using in a functioning aquarium, please add sand gradually into the tank (small amounts day by day), monitor parameter changes and observe the corals. Keep away from children. Product for aquarium use only. Not suitable for human consumption.