🐠 Ohaha Black Biochemical Sponge Filter - 24.75" Long - Ideal for Aquariums - Enhanced Absorbency Review

Large piece of styrofoam that can be used to cover an inlet and outlet filter or anything else in an aquarium. It's cheap and I probably won't buy again for a long time.

Comes in Chinese packaging. Certainly not odorless as advertised. In fact, it smells so bad that I'm afraid to use it in an aquarium. Too expensive for a cheap piece of styrofoam.

I use this material as an air purifier in my lawn equipment. Simply cut to the size and shape you want. A little oil and everything works great. Ideal thickness, 3/4" for single layer or double if needed.

Prevents dirt and food from getting back into the aquarium. Rinse and repeat. I love it. It's a nice thick piece and should last a long time. I highly recommend them and then I use a polishing machine to keep the water crystal clear.