A sponge filter is little more than a piece of foam that sits inside your aquarium and filters your water.While sponge filter designs vary from brand to brand, they are typically made up of four different parts:

1. Lift tube – Water flows up this and back into your tank.

2. Foam sponge – It wouldn’t be a sponge filter without it.

3. Strainer and bulls eye – Slides inside the sponge and allows you to connect airline tubing directly to the filter.

4. Weighted base – Stops the sponge filter from floating around your tank. The sponge sits on top of this base.

While it may not look like much, these four parts actually form a very effective filter.

1Foam sponge – It wouldn’t be a sponge filter without it.
2. Weighted base – Stops the sponge filter from floating around your tank. The sponge sits on top of this base.
3. Strainer and bulls eye – Slides inside the sponge and allows you to connect airline tubing directly to the filter.
4. Lift tube – Water flows up this and back into your tank.
While it may not look like much, these four parts actually form a very effective filter.

Key Feature:

Sponge filter provide both mechanical and biological filtration, also, the air infusion chamber produces minute bubbles which increase the oxygen solubility

Easy to set up: simply install an airline into the unit and turn on the air pump

Easy to clean: simply rinse and squeeze sponge in tank water

Recommend tank size: up to 60 gallon, excellent for small size fish like dwarf cichlid, guppy, killifish etc., or for hatcheries, maternity tanks, and fry tanks, as the filter produces minimal current and has almost no way to suck the fish through the filter

Specification: 

How Does It Work? 

A sponge filter uses bubbles of air from an external air pump, or an integral water pump to draw water through the sponge.

As water is drawn out through the lift tube or pump, it is replaced by water entering the sponge.

The surface of all the bubbles or pockets in the sponge provides a bed for the bacteria of a biological filter.

The bacteria help to break down harmful waste (ammonia and nitrite).

What Maintenance Does It Require? 

The sponge will need to be rinsed every time it becomes dirty, about once every 2 to 4 weeks.

It’s helpful to reserve the beneficial bacteria by washing the sponge gently with water from the fish tank instead of tap water.

After 3 to 6 months’ usage, the micro holes of sponge is gradually clogged by the tiny debris, the beneficial bacteria won’t have as much living space as before.