Is A Cartridge Filter The Right Choice For Your Inground Swimming Pool?

Is A Cartridge Filter The Right Choice For Your Inground Swimming Pool?

Cartridge Filtration For Pool Clearning Requires Delicate Balance

From Pool & Spa News

Filter performance is a balance of efficiency, load capacity and durability

Keeping one’s swimming pool water clean, clear, and sanitary is not always as easy as it looks.  Most pool owners rely on the equipment provided to them by their swimming pool professional to do the job of filtration, without really understanding what is happening at the microscopic level.  Additionally, they are not aware of the means and methods of their filtration, circulation or sanitization systems.  This post from PSN presents one such filter medium known as the cartridge filter, and discusses its pros and cons versus the other media availalable to polish your swimming pool water.

Here is an excerpt from the post:

Every pool owner wants clear and sparkling water, and one of the most important aspects of achieving this is the filter system. Filtration science can become very complex, but there are some basic mechanisms at work and a straightforward set of metrics that are used to compare filtration media. Let’s explore how these relate to cartridge systems.

Cartridge is popular because it delivers a balance of high water clarity and ease of maintenance. To understand how cartridge meets these needs, we first need to understand filtration mechanisms. There are three major mechanisms that occur: surface filtration, depth filtration and cake filtration.

Surface filtration is the retention of captured particles on the surface primarily by a sieving process. In other words, particles larger than the media’s pore size will be captured.

Depth filtration occurs as smaller particles pass into the channels of the media and become trapped. Depth filtration is not a principal mechanism but over time does affect its overall useful life.

Filtration is primarily based on both surface filtration and cake filtration. As soon as the first layer of particles has accumulated on the surface of the filter media, this “cake” begins to act as the filter. As the cake builds, a gradual reduction in the effective pore size occurs as some of the pores of the media become blocked, and the filtration becomes more efficient at removing smaller particles.

The cake’s ability to capture small particles relies on the stability of the cake, which is controlled by flow rate and particle size. Generally, lower flow rate allows a more stable cake. However, flow rate can be too low, and the captured particles will not form a firm cake. Conversely, a high flow rate will physically drive particles through the media support.

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