Naomi 5 メディアを読み込めませんでした。I changed to this filter with hopes to keep my aquarium water clear—AND YES! This is perfect.Aside from the design, which makes sort of a waterfalls from the rock design I made, it kept my aquarium water clear all the time, even when I don't change the water as often as before.I just wish the filter refills would be cheaper, or that it comes with free sets. Nevertheless, this is worth buying.I will try to change it with normal sponge filters throughout and see if it works the same. Because the free first set of filters that came with it were three kinds, which was a sponge, bacteria cleaner and one more (I forgot, threw out box already). I got the biggest size and got 4 free filter for 4 slots inside.The way it works, it takes water from the tube that is dipped in the water and suctions the water to the filter that is attached above on the side of the aquarium. And then the filtered water goes out of the release area like a falls, making small bubbles as it lands on the water.It is also good to note that I wrapped the suction tube with electrical tape to make it more stable and so it won't keep opening when I move it to vacuum and change the water.