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The pool skimmer also called a surface skimmer is one of the entry points of your filtration system. Like the other 2, the bottom drain and the broom outlet, it allows the suction of the water to be filtered.

Colored Pool Skimmers

However, it has something more. It is the best that allows the first filtering. Its role is therefore essential in the filtration of your pool water. To properly carry out its mission, it must, therefore, be well-sized, insufficient number and optimally positioned.

What Is The Purpose of Your Pool Skimmer?

As the 1st link in your filtration system, its 1st function, and its most important role, is the creaming of the water surface. Equipped with a non-return valve, it allows the most significant floating pollution (leaves, insects, etc.) present on the surface of your pool to be retained in a filter basket. The water, along with the finest particles, is then sent to the filtration system. It is, therefore, a fully-fledged element of your filtration system, which, thanks to easy access, controls and cleans it very quickly.

Purpose of A Pool Skimmer

Just install a woven pre-filter. Apart from its primary function, it often still performs other tasks that are just as important for the proper functioning of your pelvis.

Regulation of Water Flow:

Some pool skimmers are fitted with a flow regulator cap allowing the water flow to be modulated according to the power of the pump.

Evacuation of The Overflow:

Avoid overflowing the pool, heavy rain, and snowmelt. Yes, it can happen. To avoid this, many good automatic pool skimmers are equipped with an opening to which you can connect a hose allowing the excess water to be sent to a drainage area.

Suction Nozzle:

The pool skimmer draws water from your pool. It is this function that is taken advantage of when using cleaning accessories. It is thus possible to connect your vacuum brush or even specific models of non-autonomous hydraulic robots.

In the case of a broom, the dirt sucked up is sent directly to the filter. With robots, it will depend on the model. Some have a filter bag, thus retaining dirt, others do not, and in this case, they will go, as for brooms, directly into the filter.

Distribution of Treatment Products:

It is an ideal place to put your treatment products, whether liquid or solid. By doing so, they will be diluted when passing through the filtration system. This will avoid the risks of over-concentration linked to the direct pouring of products into the basin. Certain products, such as chlorine rollers, are too aggressive for liner-type coatings. They are placed in the basin, and therefore in direct contact with the coat, they risk damaging it.

What Is Your Pool Skimmer Made Up of?

Depending on the model, it will be made up of 5 or 6 elements.

Pool Skimmer Made Of


This is the visible part. It is made up of an orifice through which the pool water enters by suction. Often of rectangular or square shape and variable size, the pool skimmer can also be of angle and thus include an opening at right angles.

The Non-return Valve:

This is what is more commonly called “the shutter”. This moving part, equipped with a float, makes it possible to prevent the aspirated pollution from returning to the basin under the action of the reflux movements of the water against the internal walls of the skimmer.

A Basket:

Positioned in the pool skimmer, its role is simple. Retain and store the most significant waste, pollution to prevent the filter from clogging and clogging.

A Pre-filter:

This is a removable filter bag, positioned in the basket. It allows for more excellent filtering than that of the basket. While the bucket is emptied regularly, one to several times a week, the pre-filter is generally changed and not only emptied. With a filtration fineness of 200 to 300µ for the standard model and up to 100µ for the model specially adapted to restarting your pool in the spring, your filter or filter cartridge will only be cleaner and therefore more efficient.

Flow Regulator:

Some are equipped with a device allowing their flow to be adjusted according to that of the filtration pump.

The Access Hatch:

Located on the beach of the pool, so on top of the skimmer, it provides access to the basket and the pre-filter if there is one.

How Much Do I Need For My Pool?

This is an interesting question. To predict the optimal number of pool skimmers when planning your filtration system, you will have to take into account two parameters:

  • The surface of the water,
  • The flow of your hydraulic circuit.

The objective is to filter 5 to 6 times a day all the water in your pool. Your pool skimmers, associated with the bottom drain if there is one, must, therefore, be able to absorb this volume of water.

The Surface of The Water

Using the surface of the body of water as a base allows a first approach, sometimes sufficient, of the number of pool skimmers required. So to ensure excellent surface filtration, you will need to provide 1 for 25m² to 30m² of water surface. For example, your pool has a dimension of 10 x 5m or 50m² of surface, you will, therefore, need 2 (1 per 25m² slice).

For this kind of case, it’s simple. If your pool is now 8 x 5m, or 40m², you will also have to take into account the flow rate of the pipes and the pump. They will allow you to determine if you need to install 1 or 2 skimmers.

The Flow

To start, be aware that the flow of a skimmer will also depend on the diameter of the pipes to which it is connected:

  • For a pipe with a diameter of 50mm: the flow will be 7m3 / h,
  • For a pipe with a diameter of 63mm: the flow will be 10m3 / h.

The number of skimmers is then determined as follows:

  • Add the flow rate of the skimmer (s) + flow rate of the bottom drain (if there is one),
  • Compare the total with the flow rate of the filtration pump.
  • The two flows must be relatively close.

A small example to illustrate:

  • Your pump provides a flow rate of 20m3 / h.
  • Your installation includes 50mm pipes and a bottom drain.
  • You will, therefore, need two skimmers.

Indeed, with 50mm pipes, the flow is 7m3 / h. The bottom drain will, therefore, have a flow rate of 7m3 / h, as will each skimmer. In total, consequently, you have a flow of 21m3 / h which is correct for a pump of 20m3 / h. With 63mm pipes, the flow rate is 10m3 / h. With a bottom drain and two skimmers, the total flow would be 30m3 / h, which is too much for a 20m3 / h pump. In this case, only one would be sufficient.

Ultimately, determining the exact number consists of finding the best balance between the surface area of ​​the basin and the total flow of the filtration system. The regulators located on specific models of skimmers will also allow you to optimize your installation by moderating the flow.


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