UV treatment of water in private pools and spas offers an effective and natural disinfection solution. It allows the production of healthy, pure, chlorine-free water, freeing itself from the constraints of manual treatment.

If you want to equip yourself with an effective disinfection system for swimming pools or spas, the complete range of UV reactors for fresh water can be consulted online, and the sizing can be done on this page.

UV disinfection system applied to swimming pools and spas

In order to ensure optimal water disinfection, the principle of the UV treatment system is based on:

A UV-C disinfection device, installed on the filtration circuit, and through which the water circulates. Subjected to the radiation of the UV-C lamp, bacteria, viruses and algae are eliminated and no harmful by-products are produced.
A dosing pump also installed on the water treatment circuit of the pool.
Automatic pH regulation, to be added as an option, depending on the volume of the pool, or the temperature of the water.

Disinfection system benefits

In addition to guaranteeing healthy water free of any risk of contamination by microorganisms, UV treatment of water is also part of an environmental approach:

In terms of health, the water treatment, without the addition of harmful pool products, guarantees swimming without the risk of allergies and respiratory diseases (non-chemical)
It is also of interest in terms of comfort by ensuring clear, crystal clear and odorless water.
The absence of chlorine makes for a safe, environmentally-friendly process.
UV treatment makes it possible to achieve real savings thanks to a long service life of the installations and simple, reliable, and long-lasting equipment.
Last but not least, the system can be installed and maintained quickly and easily.

Sizing advice: UV disinfection applied to swimming pools and spas

For swimming pools, the rule is often that the water should be renewed every 4 hours. So, for example, a 60 m³ pool should have a recirculation flow rate of 15 m³/h. A word of advice, check the flow rate of your pump before selecting a UV reactor.

On the page dedicated to UV reactors for fresh water, many solutions are offered (up to a unit flow rate of 130 m3/h). For higher flow rates, up to 130 m3/h, please contact us!

Select “Freshwater”
Select the source of water to be made drinkable, for example “Private swimming pool and spas”.
Enter the flow rate to be processed (e.g., 15 m³/h)
Adjust the cost of electricity in your country (for example 0.09€ for France; 0.23€ for Germany)
Let 30 mJ / cm² (or adapt)
Specify the temperature of the water (normally, between 5 and 40°C is sufficient)
Please enter your email address, we will send you the design right away

Generally, the pool water is clear and crystal clear, and so > the transmittance is at 95%. However, further investigation is recommended if :

you want to treat the water of a natural swimming pool,
your water seems turbid,
Your filtration system is a bit limited

In any case, to ensure optimal disinfection and decide if pre-filters are necessary, it is recommended to carry out an analysis of the water source with these parameters:

Iron
Hardness
Turbidity
Manganese
Suspended solids (TSS)
Transmittance UV

FAQ

Is UV treatment effective against algae in swimming pools and spas?

Yes, UV treatment is a great supplement to fight algae in pools and spas. Ultraviolet C (UVC) light works by disrupting the DNA of microorganisms, preventing them from reproducing. This includes many strains of algae, especially the green algae often found in outdoor pools. However, it is important to note that UV treatment only acts on the water circulating in the disinfection chamber; Algae attached to the walls or bottom of the pool should be removed manually or with the help of a cleaning robot. In addition, a good pH balance and regular maintenance of the filter ensure maximum effectiveness of the UV treatment against algae.

Can a UV system be used alone, without any addition of chlorine or bromine?

Theoretically, a UV system can disinfect the water without the massive use of chemicals, but in practice, a UV treatment alone is not enough to ensure continuous disinfection in the pool. Unlike chlorine or bromine, UV light does not leave a residue in the water. It disinfects as it passes through the UV chamber, but once the water is back in the pool, it can be contaminated again by bathers or the environment (pollen, insects, etc.). This is why the addition of a low level of residual disinfectant (often chlorine or bromine in very low concentrations) is recommended to maintain continuous protection and avoid pollution peaks. This makes it possible to drastically reduce the doses of chemicals while ensuring health safety.

How long does a UV pool or spa lamp last, and how do you know when to replace it?

The average lifespan of a UV lamp used for water disinfection in pools and spas is between 8,000 and 10,000 hours, or about 1 to 2 seasons of continuous use depending on the intensity and duration of daily use. However, even if the lamp continues to light up visually, its effectiveness can decrease significantly over time. The production of UVC rays slowly decreases, which affects the disinfection capacity. For this reason, it is recommended to follow the manufacturer’s instructions and plan a regular replacement of the lamp (usually every season or every 12 months for intensive residential use). Some models include wear indicators or automatic alerts to facilitate this tracking.

Is UV treatment compatible with all types of pools and spas?

Yes, the majority of UV disinfection systems are designed to be compatible with pools and spas of different types and volumes. Whether you have an in-ground, above-ground, liner, concrete, shell pool or a more compact installation such as a portable spa, there are suitable models of UV reactors. What is crucial, however, is to correctly size the system according to the flow rate of the filter pump and the volume of water to be treated. Undersizing will significantly reduce the effectiveness of the treatment. The space available in the technical room, the compatibility with other treatment equipment (electrolysis, pH controller, dosing pump) and the type of swimming (residential or collective) are also important selection criteria.

Can UV treatment eliminate chlorine odors and improve swimming comfort?

Absolutely. One of the great benefits of UV treatment is its ability to reduce chloramines in the water, the secondary compounds in chlorine responsible for the famous “pool” smells, eye irritation and itching. Indeed, UV rays effectively destroy chloramines (mono-, di- and trichloramines) when they pass through the disinfection chamber. This not only makes the water more pleasant to the touch (softer, without irritation), but also improves air quality, especially in indoor pools. The combined use of UV treatment with a finer dosage of chlorine significantly improves the comfort of bathers while reducing the side effects of chemicals.