The nano-sponge filter is a high-performance filter with a wide range of use for aquarium fish such as guppies, neon tetras, shrimp, and all types of fry. The nano-sponge material features soft porous columns that enhance the proliferation of beneficial bacteria, which will help maintain water purity. Instructions: Wash the dirt off the sponge using tap water before use. Install the filter inside the aquarium and connect it to an air pump using the connector. Use a check valve to prevent backflow of water in case of a power outage. Maintenance: The nano-sponge filter can be used repeatedly. Wash the sponge with aquarium water and gently squeeze it, as tap water may kill the beneficial bacteria present on the sponge.