Sizing:
Nano: 5 Gallons and up
Small: 10 gallons and up
Medium: 20 gallons and up
Large: 40 gallons and up
Supplies Needed: A sponge filter requires air to run, so you will also need to get a small air pump and airline tubing for proper installation. If you want coarse bubbles, use the sponge filter without an air stone. If you want smaller bubbles, less noise, and better flow, add a never clog air stone inside the sponge filter. Finally, if you place the sponge filter higher than the air pump, make sure to a simple check valve to prevent water from flowing out of the tank during power outages or when the air pump is turned off.
Pore Size: 25ppi (different manufacturers rate porosity slightly different as it's an approximation)
Cleaning Instructions: Use a fish bag, ziplock bag or pitcher to put around the sponge while inside of the aquarium. Lift the water and sponge out to catch the majority of debris that will come off while removing. Next, use the aquarium water and squeeze out the debris from the sponge. Discard the water and get more water from the aquarium and repeat until sponge filter is mostly free of debris.