A technical diagram for the swimming pool pump room is necessary or compulsory for anyone planning to build a swimming pool. Why? Because the filtration group, the real engine of the pool and therefore the most crucial part, is installed there; if you think about it, what would the pool be without the filtration system: a tank, made of concrete, blocks, or any other material, which contains water. If the water is suitable for swimming, it is because of the filtration and the water treatment equipment.

How Does The pool Filtration System Work?

A swimming pool, whether it be a skimmer or an infinity pool, operates in a closed water circuit; this means that the same water is always in the pool. The water is sucked by the pump and then pushed to the filter where it is cleaned of dirt such as dust, pollen, hair. It is then pumped back into the pool after having been disinfected and heated if necessary – this is called the filtration cycle. All the water in the pool must be filtered approximately every 4 hours.

What Is Fitted In The Swimming Pool Pump Room?

The plant room is a generally enclosed space designed for receiving the various elements of the filtration system and for protecting them from the weather and heat.

  • The filtration pump and other extra pumps
  • The sand, diatomaceous earth, glass media, or cartridge filter.
  • The disinfection system, a salt chlorinator, for example.
  • The heating system or its connection when using a heat pump installed outdoors.
  • The electrical panel  controlling all these different appliances.
  • In case of an overflow pool, the water level control board.
Local technique piscine
Plant room for an overflow pool

A well-designed technical room must be easily accessible to the user to facilitate maintenance operations but shouldn’t be accessible to children. Various options are available, these are outlined below.

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Choosing the right location for the pump room

A well-located plant room can save significant costs in terms of reduced pipe lengths and minimized pressure losses. It’s best to place it next to the pool, but there are other options.

Plant rooms aren’t storage spaces

We recommend against storing chemicals in pump rooms, even if they’re well ventilated, since they can damage the equipment.

pump room size and location

Where is the swimming pool pump room to be installed?

We advise placing it near the pool and never more than 10 meters from the pool to avoid pressure losses.

  • The underground or semi-underground swimming pool pump room can be made of masonry or concrete, but there are also prefabricated polyester pump rooms. It is better to locate it, or at least the pump, below the water level and the valves must be easy to handle.
  • The above-ground plant room can be a dedicated construction or an existing room close to the pool.
  • The integrated pump room   is often located in a ladder, for example for the Desjoyaux swimming pool brand. Usually, no additional equipment can be added to it and no pool pump room diagram is made.

How big should be the pool plant room

Before drawing the swimming pool pump room diagram, it is important to confirm the dimensions of the room itself.
It should be remembered that below 2 m², no authorization is required in France. From 2 to 20 m² a “Déclaration préalable” for minor works, possibly the same as for the swimming pool, must be filed. Above 20 m², a building permit will be required. If you wish to know more about the French regulations, you can find more information here.
An area of 2 m² seems enough for a skimmer pool, but an average surface of 4 m² is usual for an infinity pool; the main thing is to design a pump room where you can house additional equipment later on.

What Is The Purpose Of A Diagram Of The Pool plant Room?

Making a schematic of the pool filtration system has several advantages:

  • Do not oversize the swimming pool pump room that will house all the equipment.
  • Facilitate the installation of the different devices: pump, filter, heating, disinfection, etc.
  • Place all valves at the correct location
  • Understand how your pool works
  • After construction, have a document to refer to in case of malfunction.

We advise combining this plan with a diagram of the piping layout from the pool to the technical room.etc.

Drawing Up A Diagram Of The Pool Technical Room

This plan must be carried out after the piping layout from the pool to the pump room. Indeed, the positioning of the pipes and valves depends partly on the entry into the technical room. Therefore, each plan should be unique.

Positioning of the filtration unit and optional equipment

Depending on the pipes coming from the pool, the pump, and filter will be placed to save pipe lengths, elbows, and tees and make the best use of the available space. The filtration system is, of course, calibrated perfectly considering the volume of the pool, the position of the technical room, but also the climatic conditions and the number of bathers, at least for those receiving the public. All this is easily done using simple calculations and the pump efficiency curve, which differs from one manufacturer to another, even for the same output.

Connection of the various hydraulic and electrical components

Pipes and electrical cables are shown to facilitate the installation of all equipment in the pump room.

Location of valves and other safety devices

Valves, like a tap, close off the flow of water and are therefore essential for filtration running,  isolating part of the hydraulic system for further repairs or equipment changes. For an overflowing pool, the correct positioning of the non-return valves is crucial to prevent accidental draining of the pool.


Installation of the various pool filtration components in the pump room isn’t random. Proper placement of pool filtration components is crucial because it ensures efficient water circulation and filtration. By strategically positioning the equipment, you can optimize water flow, reduce energy consumption, and maximize the effectiveness of the filtration system, ultimately leading to cleaner and healthier pool water. If you hire a pool builder, they’ll know where to put the equipment. You will need custom hydraulic plans if, like many of our clients, you have only a ground plan without any knowledge of the piping and equipment layout.