Review on EA Performance HOB Power Filter - Ideal for 4 Gallon Desktop and Betta Aquariums - Non-China Manufactured by Barbara Freeman

Nice little device. It comes with a small sponge filter which I honestly think is completely useless. After about an hour I would have thought it would be full of dirt. The filters (Aquarium Masters 3 Pack Nano Aquarium Carbon Filter Replacement Nano Filter!) for the device are inserted at an angle (no instructions and it's not obvious) and compress the sponge that comes with the device. I don't know if it's supposed to work that way. The inlet pipe doesn't go as deep into the tank as on my previous one so I went with the old one.