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How Filter Media Functions In a Filtration System

The Filter Guys

How Filter Media Functions. The job of the media is to capture particles and allow the fluid to flow through. For fluid to pass through, the media must have holes or channels to direct the fluid flow and allow it to pass. That’s why filter media is a porous mat of fibers that alters the fluid flow stream by causing fluid to twist, turn and accelerate during passage.

The fluid changes direction as it comes into contact with the media fibers, as illustrated above. As the fluid flows through the media, it changes direction continuously as it works its way through the maze of media fibers. As it works its way through the depths of the layers of fibers, the fluid becomes cleaner and cleaner. Generally, the thicker the media, the greater the dirt-holding capacity it has.

Looking at a cross-section view of the fibers:

we can see how the flow stream is accelerated as it flows into the spaces between the fibers.

This is applies to all liquid filters, be they oil, fuel, water of water glycol. For more information on filtration products and replacement elements please contact us for a chat. We’re here to help.

How Filter Media Collects Particles

The Filter Guys

How Filter Media Collects Particles. There are four basic ways media captures particles.

The first, called inertia, works on large, heavy particles suspended in the flow stream. These particles are heavier than the fluid surrounding them. As the fluid changes direction to enter the fiber space, the particle continues in a straight line and collides with the media fibers where it is trapped and held.

The second way media can capture particles is by diffusion. Diffusion works on the smallest particles. Small particles are not held in place by the viscous fluid and diffuse within the flow stream. As the particles traverse the flow stream, they collide with the fiber and are collected.

The third method of particle entrapment is call interception. Direct interception works on particles in the mid-range size that are not quite large enough to have inertia and not small enough to diffuse within the flow stream. These mid-sized particles follow the flow stream as it bends through the fiber spaces. Particles are intercepted or captured when they touch a fiber.

The fourth method of capture is called sieving and is the most common mechanism in hydraulic filtration. As shown at right, this is when the particle is too large to fit between the fiber spaces.

Affordable Portable Filtration Solutions.

The Filter Guys



The HF 10 is a portable filtration unit used in the transfer of hydraulic and lubricating oil.

It is very simple and easy to use. It’s powered by a small but powerful electric pump and comes equipped with an overload by-pass safety system. It can be used with various different elements for various levels of filtration. There is also the option of a pressure differential gauge so you know when the filter element requires servicing. The unit offers a second to none filtration quality that captures many dirt particles including copper, steel and sand. It comes mounted on a buggy and supplied with suction and return pipes.


Flow rate: 20-25l/min

Power: 750 watts

Power supply: 230 V – 4.6 Amp. – 50 Hz

Operating temperatures: -10 degrees C to +40 degrees C

Fluids not permitted: Diesel/Petrol, Water, Liquid food products, solvents.

Dimensions: 400 x 660 x 310

Elements: 3, 6, 10, 25 micron glass fibre. 10, 25 micron cellulose. 60, 90 micron wire mesh. 10, 25 micron water absorber.