One of the main routes for the introduction of alien marine organisms is ballast water. Freshwater or saltwater is kept in ships’ ballast tanks and cargo holds as ballast water.

When ships are not carrying cargo, are not carrying enough cargo, or when greater stability is needed due to choppy seas, it is utilized to enhance stability and maneuverability throughout a voyage.

In order for a ship to float low enough in the water to pass beneath bridges and other structures, ballast water may also be utilized to increase weight.

Typically, when a ship has delivered cargo to a port and is leaving with little to no cargo, ballast water is injected into ballast tanks. At the next port of call, when the ship is picking up new cargo, ballast water is subsequently transferred and discharged.

A ship may discharge or take in a small amount of ballast water at each port when it is delivering or receiving cargo to numerous ports. In these circumstances, a variety of waters from several ports are present in the ship’s ballast water.

Ballast water discharge could bring non-native creatures into the port of discharge. Exotic species, alien species, and nonindigenous species are other names for these introduced species, also known as bioinvaders.

Why do we need filtration for ballast water?

Why we need filtration for ballast water?

As we mentioned above, the discharge of ballast water is dangerous to the original seawater environment, harming aquatic organism. Recently, more and more people attach importance to the environment and aquatic organism protection. After realizing the perniciousness of the ballast water, filtration is obligated.

In 2004, the International Maritime Organization (IMO) formulated the International Convention for the Control and Management of Ship’s Ballast Water and Sediments.

So far, the discharge of the ballast water finally has a standard. It also means a filtration system is needed in the cargo ships to purify the water to achieve the regulations.

The challenge of treat the ballast water

The ballast tanks can be compared to the aquarium, it has their own ecosystem. However, when it is discharged into another place in the sea, it is extremely harmful and dangerous to the local aquatic organism.

The objective of filtration is to prevent the emission of those organisms or other contaminants. There are large quantities of organisms in ballast water, such as jellyfish, crabs, bacteria, plankton, and viruses, which can easily block the downstream pipes and other equipment.

The solution of filtration for ballast water

The most commonly used filter for ballast water is an automatic backwash filter with a filter rating of 50 μm. The filter automatically removes marine species larger than 50 μm and returns them to nearby seas when ballast water runs through it. It also filters out particulate contaminants that could clog pipes and harm equipment further down the line.


Filtration is not only for the protection of the pipes and equipment but also for the aquatic environment. Sometimes, the profits can not be the only thing we care about, we should think about a long-term vision. The ballast water filtration is a good example, that we need to filter out the contaminants for equipment and the local ecosystem.

Brother Filtration is deeply involved in the filtration field. We do everything about filtration, and we solve every filtration problem. More than manufacturing filter products, we also provide filtration solutions for our clients. Our automatic backwash filter could be your perfect choice for ballast water filtration.


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