Pacakge Includes – 1pcs x Sponge + 1pcs x Container + 1 bag x Ceramic Media Balls + 2pcs x Sucker Warm Tip – Soak in aquarium water for 5 minutes before use, which is good for nitrifying bacteria to form. Easy to Use – Just install airline into the unit and turn on the air pump.It is a good way to clean and oxygenate your tanks. Don’t use tap water to clean it, simply squeeze the sponges in tank water. Suitable for Fish Tank Up to 26 Gallon – It can be easily hidden on the back wall of the aquarium. Suitable for freshwater & saltwater and different kinds of ornamental fish breeding, breeding and fish formation. Please Note – Colony rinsing sponge must be washed with aquarium water and DO NOT USE hot water. This product needs to be connected with an air pump. The air pump should be placed on the top of the fish tank to prevent water from flowing back to the air pump due to power failure.