Penn-Plax Cascade 300 Power Filter – Hang-On Filter with Quad Filtration – Great for Freshwater and Saltwater Setups

The Penn-Plax Cascade 20 Power Filter is a mini hang-on filter recommended for freshwater and saltwater setups up to 7 gallons. The filter features quad filtration and adjustable flow control knob. The filter does not come with a pre-filter and the carbon side of the filter should face the tank. It is not suitable for using ceramic and carbon for the filter media. The filter works well when water is put into the box part. The filter is too big for a 1-gallon bowl. The filter is great for a low price, but it only comes with one filter cartridge. The filter is pretty powerful but may require blocking of the flow with some fake plants in a 5-gallon tank. It is an excellent filter for a 10-gallon tank. The filter is used as a water bowl filter for a cat, and it works well with a modification to the input tube. The filter is quiet, easy to use, and clean. The filter cartridges provided have minimal carbon in them and need frequent replacement. The filter is perfect for a 2 1/2 gallon tank. Some users complained about the weak water flow and the filter being dead in less than a year.