a large foam rubber block connected to an air lift tube. Water is drawn through the sponge, which acts as a mechanical filter and a bacteria colony. Especially useful in breeding or fry tanks.
a filter for small tanks made of plastic foam which traps tiny particulate matter, but mostly provides surface area for the growth of helpful bacteria.
A foam block connects to an airlift tube or, rarely, a powerhead. Water is drawn through the sponge, which acts as both mechanical and biological filter. Excellent for fry tanks, as the tight cells in the sponge and the gentle flow prevent the tiny fish from being sucked into the filter.
A simple Internal Filter in which water is drawn through a synthetic sponge which traps particles and provides a surface on which nitrifying bacteria can grow.
a simple design that uses an air pump to circulate water through a sponge sitting inside of the aquarium
a very simple, yet effective filter
A filter that provides a mechanical and biological filtration. The filter consists of a lift tube connected to a power head that draws water through a sponge block removing the waste particles and growing bacteria.
This filter provides both mechanical and biological filtration. It consists of a large foam rubber (sponge) block connected to a lift tube or small power head. Water is drawn through the sponge, which acts as a mechanical filter by removing particles, and gives dentrifying bacteria colony a niche (biological).
A simple, but effective form of filtration. A current of air is passed through the center of a sponge such that as the air rises, it draws water into the sponge, thereby filtering the water. Sponge filters are very easy to clean (rinse and squeeze in water) and last years. Plus, baby fish don't get trapped in them like so many other filters. There are several styles of sponge filters ranging from square sponges to long cylinders to tall cylinders.
