Great

I use these filters all the time in my fish tank and they do an excellent job. I will continue to buy these. Does not bother the fish at all as long as it’s changed regularly.

Tetra Carbon Filters come in various sizes and amounts in a pack. This specific one has 2 in a pack that fits specifically Whisper EX20, Medium. use 1 at a time until filthy or change every 3 or 4 months. Removes odor, discoloration and gunk. Very effective and super easy to use. Very reliable and cheap! Make this a part of your every day tank health helper Filter