The Hydro-Sponge filter provides both Mechanical and biological filtration. Aerobic bacteria colonize the sponge, providing a bacterial substrate to facilitate the nitrogen cycle. In addition, the Hydro sponge traps larger waste particles, mechanically cleaning the water. All Hydro-Sponge filters are designed for stack-ability to increase the filtering capacity. Very easy to clean, just rinse and squeeze!
I didn't use it immediately as my 29 gallon needs other things in order to set up properly but I did start running it in water to see how it works and so far so good. Just as I expected. We will see once the tank is completely setup and stocked.
These work great in my 55 gallon aquarium.
I am very pleased with my never clog air stone I also bought the filter intake Spence and a sponge filter all the products work great shipping was fast and everything arrived in perfect condition will buy from you again thank you
Work great. A bit slow in water clarification but a great biological medium. Easy to clean. Captures wayward food particles which the smaller fish can eat at their leisure.