Winterizing your pool is part of pool maintenance to protect your equipment from freezing and maintain water quality. If you're among those who think it's enough to empty your pool in winter and refill it in spring, you should know that this is a big mistake to avoid! The ground around your pool will exert pressure on the structure. As a result, your pool may crack or warp if left empty for long periods. Last but not least, proper winterization will make the next season much easier. As you can see, winterizing is an essential step. There are two ways to do this: active winterization or winterization. We explain how in this article!

When to winterize your pool?
Your pool should be winterised when the water temperature drops steadily below 12°C for chlorine-bromine pools and below 15°C for saltwater pools. Depending on the region where you live and the weather, the period is generally between late September and mid-OctoberIt is important not to delay winterising, as frost is your enemy. It can cause serious damage to both the structure and the pipes. You have been warned! Discover the 5 mistakes to avoid when winterising your swimming pool.
The importance of wintering for water quality
Winterizing a swimming pool is a relatively long process, since it involves thoroughly cleaning your pool and storing the equipment for the winter in the right conditions. This is a very important step, however, as it determines the quality of the water next season, and means you won't have to use maintenance products when you put your pool back into service.
This will help you avoid potential problems related to cold weather and get off to a good start next season.
Your ICO Pool and winterizing
Your ICO POOL is not designed to remain submerged in your pool throughout the winter when the water temperature drops below 10°C. Therefore, you must also winterise it and store it until the next season. All the information you need to know about winterising ICO Pool.
Choose between passive or active wintering
Passive pool winterization
Passive winterization is recommended if winters are rigorous in your location (temperature below 5°C, frequent freezing). This procedure allows the protection of the pipes from freezing. This includes the total stop of the treatments and the filtration during the whole winter period.
Benefits and drawbacks
The best thing about passive wintering is that you don't have to look after your pool for several months. Neither filtration nor water treatment are necessary! What's more, you'll have peace of mind in the event of an exceptionally cold winter, since the entire hydraulic circuit is cut off and your equipment is well protected.
On the other hand, this type of winterization requires a fair amount of elbow grease to implement, but also when starting up your pool. In conclusion, it's less environmentally friendly in terms of water consumption, since you'll need to refill it in the spring. However, the absence of electricity consumption (filtration) at a time of year when electricity is more expensive, is a real economic offset.
Active winterization
This wintering mode is for you if the winters are mild (temperatures above 0°C). Dynamic wintering involves running your pool at idle speed, without having to drain the water. All you need to do is keep the filtration system running at idle speed (1 to 3 hours a day). Secondly, to regularly treat your water quality, not forgetting to clean the filters when necessary.
Advantages and disadvantages of active wintering
Active winterization has several advantages: firstly, it's easy to implement, because after a good cleaning and a winterization treatment adapted to preserve water quality, the pool is already ready. Secondly, in terms of chemical consumption, this method is much more economical, since it requires little treatment when the pool is restarted. As a result, it's also more environmentally friendly, especially as you don't need to empty the water from your pool and then refill it in the spring. To conclude on the advantages, the sight of a pool with full water all winter long is still more aesthetically pleasing than a covered pool.
However, active wintering requires your presence and vigilance throughout the winter. You'll need to maintain water quality (check pH and alkalinity, clean the surface), but above all keep filtration running for a few hours a day throughout the winter. Electricity consumption for your pool is therefore higher compared to passive winterizing.
The common steps between passive wintering and active wintering
Cleaning the pond for wintering
Start winterizing your pool by removing debris, leaves and any unwanted residue from the pool. Thoroughly clean the waterline, walls and bottom of the pool with a brush or vacuum cleaner. This will help you to avoid any problems caused by the cold, and get off to a good start next season.
How to do a passive winterization of your pool
Here are the steps for successful passive wintering:

Add shock treatment
Use a chlorine or bromine product (depending on your pool). Read the instructions carefully to ensure correct dosage and avoid damaging the liner. These products provide effective protection against algae and bacteria.
Start filtration for 24 hours
Filtration ensures that the chemicals are evenly distributed in the water, providing uniform protection and maximum efficiency. It must be run continuously for the duration of the treatment's action. That is, between 24 and 48 hours, according to the recommendations on the product label.
Cleaning filters
Clean filters ensure optimal filtration and reduce the risk of malfunction. Each type of filter (cartridge, sand, diatomaceous earth, etc.) has its own cleaning system that must be maintained regularly. Take this opportunity to clean the entire system (filter pump, filter) one last time.
Lower the water level
It's not a question of draining the water completely from your pool (which could endanger its structure), but of lowering its level to around 10 cm below the discharge nozzles. This will prevent overflows and major damage caused by freezing water.
Drain the circuit and stop filtration.
For this step, drain the filtration circuit, close the valves and switch off the filtration. These actions are crucial to prevent frost damage.
Storing equipment
Store the ladder and cleaning tools in a clean, dry place. This protects them from the elements and extends their lifespan.
Pour winterizing product
This product has an algicide and anti-scale function. It maintains good water quality while protecting your equipment from winter. Don't hesitate to use a broom to spread the product throughout the water. The dosage of winterizing products depends on the brand and, above all, the volume of water in your pool.
Add winter accessories
Specially designed to absorb pressure from ice, the floats minimise the risk of structural damage.
Couvrir la piscine
Cover the pool with a suitable winter cover that provides complete protection for your pool from the elements and debris during the winter.
How to winterize in active mode?

Clean your pool for winter
Start the active winterizing procedure by removing debris, leaves and any unwanted elements to ensure a clean and healthy base. This applies to the pool walls, the pool floor and the water line.
Measure and adjust pH and TAC
Adjust the pH and TAC (Full Alkali Titer). Adjust the pH if necessary (between 7.0 and 7.4 for a chlorine pool; between 7.4 and 7.6 for a bromine or salt pool). Then check alkalinity: in the fall a slightly low TAC may be tolerated, between 80 and 150 mg/l) .
A balanced pH and adequate TAC are essential for healthy water over winter.
Add shock treatment
Pour the shock treatment directly into the water. This step reinforces the water's protection against algae, bacteria and other contaminants that thrive in winter.
Start the filtration process
Activate water filtration for 24 hours. This ensures even product distribution and maximum effectiveness in preventing water problems.
Clean the filter
Clean filters optimize filtration performance and maintain water clarity. Secondly, don't forget to clean the filtration pump (tank) too, and to change/renew your filters if necessary.
Pour winterizing product
Pour the product into the water, circling the pool to distribute it evenly. This product (suitable for use with chlorine or bromine treatment) provides extra protection for water and equipment during the winter season.
Adjust the filtration time
Dynamic winterising involves running your pool at a reduced rate. Simply maintain reduced filtration activity (2 to 4 hours per day).
Cover with a winter cover (optionnel)
It is not compulsory to cover your pool during active winterizing. It's only necessary if temperatures drop unusually low, or in the event of wind or heavy rain, which can affect water quality. So, depending on the winter in your region, it's a good idea to get equipped.
Tips for winterizing your pool
Winterizing your pool provides long-term protection for your equipment. Whether you choose active or passive winterizing, the operation takes time to carry out properly. So plan to devote a weekend to it. And don't forget that this thorough cleaning will improve your pool's water quality next season.
If you wish to winterise your ICO, we explain everything you need to know!
