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The water-absorbing filter, protecting your fuel
The water-absorbing filter, protecting your fuel
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The water-absorbing filter, protecting your fuel

24.10.2023

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Understanding water-absorbing filters

Protecting fuels such as diesel, petrol and biodiesel, water-absorbing filters are at the heart of the "Watersorb" range from HIFI FILTER®. Unlike traditional filters, the Watersorb element does more than just capture impurities such as dirt, dust and rust. This product is capable of eliminating the water contained in the fuel thanks to a two-layer media.
Designed specifically for fuel distribution applications, this range ensures that your vehicle's fuel tanks are refuelled with a fuel that is free from particles and, above all, water, the main scourge of common rail engines. These filters will also extend the life of your engine's filtration system.
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The dangers of contaminants for fuels

Water: a threat to engines

Mainly the result of infiltration and condensation, water is a formidable contaminant in a fuel tank. Its presence represents a real danger for engines, particularly modern engines because of their increased sensitivity to humidity. On these new-generation systems, for example, water could cause the injection rails to seize.
Installing a Watersorb filter is the safest way to prevent free water distribution in your equipment. By removing the water, the filter reduces fuel degradation, rust, corrosion and wear, preventing further potential damage.

Particles: abrasive contaminants

These solid contaminants generally come from the manufacturing process, multiple transfer operations, the ambient environment, etc. These particles can be abrasive and cause considerable damage to the engine. That's why proper filtration is essential to protect your equipment.
As well as effectively removing water, a Watersorb filter retains these unwanted particles, providing double protection for the engine. This filter preserves fuel quality and extends engine life, avoiding costly repairs and unexpected downtime.
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Deciphering the two-layer Watersorb filter media

A Watersorb filter is divided into two distinct layers. Each is made up of a specific media, responsible for retaining a specific contaminant.
  • The first layer consists of a hydrophilic polymer powder, a material capable of attracting water particles. As the fuel passes through the filter element, the polymer captures and absorbs the unwanted water. Based on the same principle as a nappy, this absorbent media can absorb up to 25 times its weight in water until saturation.
  • The second layer is made up of a pleated cellulose filter medium, which retains harmful particles.

With a water absorption capacity of up to 540ml and a filtration fineness of up to 2µm, HIFI FILTER® water-absorbing filters provide complete, effective fuel filtration. Your equipment and its systems will be truly protected during refuelling.

When should a water-absorbing filter be replaced?

To maintain the effectiveness of water-absorbing filters, it is essential to know when to replace them. As water is absorbed, the fuel flow rate gradually decreases. This means that the hydrophilic layer of the filter expands. When the media is completely expanded and fuel flow is significantly reduced, this is the sign that the filter cartridge needs replacing.

Strategic placement of water-absorbing filters

Water-absorbing filters are mainly installed on manual or electric pumps for mobile and fixed refuelling, particularly in the public works, agricultural and marine sectors.
To maximise their filtration efficiency, it is essential to position them judiciously on the supply chain, i.e. after the pump. In this position, a Watersorb filter can be installed alone or in conjunction with a particulate filter.
  • As the fuel passes through the Watersorb filter, it absorbs free water with its hydrophilic media and captures impurities with its cellulose media. The fuel is now clean and ready to dispense via a nozzle.
  • If the Watersorb filter is combined with particle filtration, the fuel first passes through the particle filter, which is responsible for retaining the majority of impurities. Next, the fuel, freed of its harmful particles, reaches the water absorber. After this double filtration, the clean fuel can be dispensed using a nozzle.
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Why can't a water-absorbing filter be fitted to a vehicle?


As the filter captures water, it freezes, gradually blocking the flow of fuel. When the maximum level of absorption is reached, the filter element is completely frozen, resulting in a net reduction in fuel flow. Installing the filter directly on a vehicle could lead to flow problems, affecting engine performance or even a breakdown.
The principle is the same for fuel distribution. If a water-absorbing filter is installed before the pump, the more it congeals, the greater the loss of pressure, and the flow rate will fall until the pump deteriorates.“

Additional accessories for optimum use

For a complete Watersorb filter installation, HIFI FILTER® offers complementary products such as a pressure gauge* or filter heads. Please contact us to find out more about our entire Watersorb range.
(*) The pressure gauge acts as a clogging indicator, allowing you to replace your filter proactively.
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In addition to water-absorbing filters, HIFI FILTER® offers a wide range of filtration solutions dedicated to fuel distribution. The treatment of storage tanks, the filtration of pumps and the installation of mobile refuelling solutions on site are all part of our product catalogue.
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