Pools FAQ

Are you planning to buy a pool or have you enjoyed your own pool for some time now? Perhaps you have some questions for us. That is why we have listed a number of frequently asked questions together with a concise answer. If you would like to receive more information or if you cannot find the answer to your question here, please do not hesitate to contact us.

How can I avoid an unpleasant chlorine smell?
Chlorine is necessary to keep your pool water clean. The different chlorine particles combine with the microorganisms to disinfect the water. When the chlorine combines with debris chloramines form and these result in an unpleasant chlorine smell. So what can you do to avoid this? First, the acidity of the water must be kept neutral to avoid even more chloramines. It is also important to prevent too much debris in the pool water. A quality pool filter and an automatic measurement and control system by Leisure Pools will help you do this.
What is osmosis?
Osmosis is also referred to as blistering. It is a typical phenomenon in polyester fibreglass pools or concrete pools with a polyester interior that happens when the pool water can pass through the polyester wall. This results in pressure and blisters in the polyester. After a while, the blisters burst and turn black. High water temperatures make this process worse. That is why Leisure Pools makes its pools out of 100% full epoxy vinyl ester. This material is not sensitive to osmosis and allows us to offer you a lifetime osmosis warranty.
Is it possible to achieve chlorine-free swimming against asthma and allergies?
For asthma patients and people with allergies or sensitive skin or mucous membranes, it is absolutely essential to keep your pool as clean as possible with as few chemicals as possible. However, fully chlorine-free swimming is still in its infancy. Leisure Pools does all it can to reduce the use of chlorine in our pools to an absolute minimum. A self-cleaning roller shutter section, antibacterial walls, fully automatic disinfection, a good pool filter, etc. all help you reduce your chlorine use. Read more in our section on ‘An environmentally friendly pool‘.
How can I avoid scaling on the pool walls?
Scaling will appear on the walls of your pool when your pool’s acidity becomes unbalanced. Regardless of the amount of calcium in your pool – which will depend on your local area – scaling is caused by high pH levels above 8.0 and especially above 8.5. A high pH level makes the water highly alkaline, may cause scaling problems and can be aggressive to the skin. The ideal pH level for your pool is 7.2, with a lower limit of 7.0 and an upper limit of 7.4.
What should I do in case of green pool water?
If your pool water turns green, you can assume that the pool was insufficiently disinfected for a while, which causes algae to appear. To solve this, you first need to adjust the pH level with a correction liquid or granules. After correcting the pH level, you need to add chlorine. This is referred to as a chlorine shock treatment. After the shock treatment, the pool must be filtered for at least 12 hours during the day. The filter must then be stopped during the night. The algae will turn an intense green, die and slowly sink to the bottom. Now it is important to vacuum the pool with very slow movements to avoid dispersing the algae dust. After vacuuming, you should clean the pre-filter, backwash the filter and rinse the fine filter. If the chlorine shock treatment did not have the desired result, consult a specialist, as this may indicate a less common, resistant type of algae.
How can I prevent green pool water?
You can prevent green water by performing sufficient preventive checks. If you have a high-performance filtration system, once a week is enough for normal use. In case of an imminent storm, extremely high air temperatures or intensive use, it is advisable to perform an extra preventive check. In those cases you can slightly reduce the pH level to increase the efficiency of the chlorine. Sufficient filtration is always important. At a water temperature of 28°C, you should filter your pool for at least 14 hours. When your solar roller shutter is closed, the water must always be filtered to ensure the energy is released properly and to protect the roller shutter against damage.
Why should I invest in fully automatic disinfection?
Fully automatic disinfection (also referred to as a measurement and control system) is provided by a device that measures and adjusts several parameters of your pool water. The system’s main advantages are its convenience and the reduction of chlorine levels in your pool. The automatic disinfection of your pool results in chlorine levels that are 3 to 5 times lower. This avoids scaling, reduces any chlorine smell and prevents irritation of the skin, mucous membranes, airways and lungs. A well-composed filter installation combined with fully automatic disinfection will guarantee crystal clear water of the best quality.
What is the right pool pump capacity for my pool?
Always rely on a specialist to calculate the capacity of your pool pump. The under capacity of the pool filter will put the users’ health at risk, while over capacity will lead to unnecessary energy consumption. Always ask your pool construction company to justify its choice and obtain information on the conditions and benefits of a variable speed pump. In some cases savings of up to 150% are possible.
Why choose a variable speed pump?
Ideally pools would be filtered 24 hours a day, as this would avoid having to rely on chlorine to disinfect the water. With a conventional pump this would result in significant energy costs. This is where the variable speed pump comes in. With the right analysis, a variable speed pump can reduce the energy consumption of a conventional pump used for an average 14 hours a day to less than half for 24 hours of filtering. It also allows you to filter your pool continuously in winter at an average consumption of 100 watts. This will prevent your pool water from freezing and will make it easy to start using your pool again in spring.
How can I save on my pool’s energy consumption?

Experience has taught us that customers are prepared to pay the right price for a good quality pool if the operating costs are kept as low as possible. There are several ways of achieving this:

  • Limit the loss of energy. You can do this by having the technical services built as close to the pool as possible (10 to 20 metres is fine). Avoid a basement installation and ensure your system is optimised with as few bends as possible.
  • Choose a heavy gauge synthetic interior for your pool and a solar pool cover. Leisure Pools’ nano insulation technology will prevent the heat from escaping from your pool and the solar roller shutter itself will heat the water further.
  • Have the pump capacity calculated for your specific system to avoid insufficient filtering and excessive consumption. The ideal pump has a variable speed to save energy.
How do I choose between a concrete and a fibreglass pool?
There are different pool types on the market. If you are planning to buy a pool, you will often encounter the terms ‘concrete pool’ and ‘fibreglass pool’. The main difference between both types is their construction method. A concrete pool is poured on-site, while a fibreglass pool is manufactured in a workshop. If you want to find out more about the differences between these two pool types, read the section on ‘Pool types’.
Will I need building permission to install my pool?

Before you make the decision to have a garden pool installed, you must check carefully whether a permit is required. The rules are different from country to country, sometimes from town to town.


The Netherlands

The legislation on pool construction is rather ambiguous in the Netherlands. Leisure Pools will check for you whether a permit is required. We first check this on We enter the location and the type of work, which will result in a simple yes or no. Sometimes we are referred to the local authority to check whether the land use plan allows the installation of a pool.



In Belgium the construction of a non-covered construction (such as a pool) is exempt from any type of permission up to 80 square metres per unit in side and back gardens. Existent, non-covered constructions must be included in the calculation of this maximum surface area. Strictly necessary access points and drives are not included. This exemption only applies to:

  1. Structures that have no building volume
  2. Structures that are less than 1.5 metres above ground level
  3. Structures that are at least 1 metre away from the land boundary
  4. Structures that are less than 30 metres away from the home
  5. Structures that are not situated in a vulnerable area
  6. Structures that are not located in a riparian zone, marked basin management plan or sub-basin management plan or within the 5-metre wide strip along the bank of a watercourse

For more information you can always contact your local authority.

Source: Flemish Government Department ‘Ruimte Vlaanderen’
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