Comments: I have had this filter for 2 months now and it is truly the best small tank filter I have ever used. It has a flow rate of 20 gallons per hour and filters very quietly. It has great flow for its small size. It uses an air pump to move the water up the lift tube.
It includes filter box, uplift tube, filter cartridge, and airlne tubing with diffuser. It works so good that everytime I clean my gravel there is less gunk than before when I had the Whisper Internal Micro Filter 2-5 in my Mini Bow 2.5 Gallon aquarium with a male Betta in it.
The cartridges are easily replaced once a month or when water flow out of the filter is dramatically reduced. The filter was approximately $9.97 at your local Wal-Mart store and filter cartridges are $2.88 at Wal-Mart.
This filter uses Small Sized Filter Cartridges that come in an economical 2 pack.
Comments: I have this filter also… I bought it because it was cheap, but it has so far given me no problems.