Upettools Aquarium Biochemical Double Sponge Filter up to 55 Gallon Green
Product Review (submitted on December 8, 2021):
This filter is superb, it worked immediately right in-front of my eyes. Within minutes the water was very clear and the sponges very dark. the good thing is all I had to do was remove them, rinse them off with water only and put them back. I strongly recommend these filters. I would advice anyone to buy the coloured ones instead of the black ones because you will actually see when they need to be washed because the colour will get darker.