Description  Directions for Use Step 1: Soak air stone for about 1-2 hours before use. Step 2: Connect air stone to air tube. Step 3: Connect air tube to air pump outlet. Step 4: Attach air pump onto the outside wall of aquarium tank. Please locate the pump above water level to avoid any possible water counter flow. Step 5: Immerse air stone into aquarium tank. Step 6: Connect power adapter to electricity socket. And you are good to go.