Winterising swimming pool

Winterizing Products for Swimming Pools: Winter Protection and Maintenance

Winterizing products for swimming pools are specially formulated to keep your pool water in perfect condition during the coldest months of the year. Thanks to their efficiency and ease of use, they prevent problems such as algae proliferation, dirt accumulation and water deterioration, thus facilitating the reopening process in spring.

why choose swimming pool winterization products?

Opting for these products offers essential benefits:

• Comprehensive protection: They prevent the appearance of algae, bacteria and lime scale build-up.
• Ease of reopening: They keep the water in good condition, greatly simplifying the restart of the swimming season.
• Save time and money: They significantly reduce the need to empty and refill the pool at the beginning of the new season.
• Prolonged care: Maintain water quality with minimal application during long periods of inactivity.

how do pool winterizing products work?

Winterizing products work by stabilizing and maintaining balanced water chemistry levels. When applied, these products create an environment that prevents the development of microorganisms and scale deposits, protecting both the pool structure and water quality during the winter.

Main characteristics of the wintering products: Composition and Format

• Liquids: These are products in fluid form, easy to dose and apply, suitable for any type and size of pool. They usually have a concentrated and homogeneous formulation, which allows a fast and effective distribution in the water. Their main advantage is the speed of action, in addition to facilitating automatic application in dosing systems. They are ideal for both in-ground and removable pools. They require prior agitation if they have been stored for a long time to guarantee their effectiveness.
• Solids: They come in the form of buoys, tablets or floating dispensers. They are slow-release and are intended especially for small pools or occasional use. They have the advantage of maintaining a constant action for weeks without the need for intervention. They are very practical for owners who do not wish to handle liquid products and are looking for a more autonomous maintenance. They must be removed in case of early reopening of the pool.
• With Copper: These overwinters contain copper salts as a high-power algaecide agent. Their effectiveness against algae is very high, even in extreme conditions. However, they can cause stains in pools with liner or polyester liners if the recommended dosage is exceeded or if the pH is out of the optimum range. Not recommended for pools with hard water or high metal content.
• Copper Free: These are environmentally friendly formulations designed to minimize environmental impact and prevent staining in pools with delicate liners. Although their algaecide effect is milder, they are safe for all types of finishes, including liner, tile and polyester. Many of them are biodegradable and free of heavy metals, which facilitates subsequent emptying of the water without environmental impact. They require maintaining the chemical balance of the water to optimize their performance.

Buying Guide: What is the best winterizing product for your pool?

copper or non-copper winterizing?

This is one of the most important points when choosing.

Copper winterizing products

• Advantages: they are usually cheaper and more effective as algaecides.
• Composition: they contain copper salts, which help inhibit algae growth.
• Recommended for: pools with tile or similar liners.
• Caution: if overdosed, copper may react with the pH of the water and stain the tile joints (turning them green or black).

Copper-free winterizers

• Advantages: more respectful of coatings and the environment, no risk of staining.
• Composition: use other active agents, such as biguanides or other broad spectrum polymers.

Recommended for:

• Pools with liners
• Polyester pools
• Pools with reinforced sheet

2. liquid or solid form?

The choice between liquid or solid winterizing depends on the volume of the pool and the average water temperature during the winter.

Liquid overwintering

• Ideal for: small and medium size pools.
• Advantages: Easy to dose, especially in volumes less than 40 m³.
• Allows a more precise application adapted to each pool.
• Limitations:Its effectiveness is reduced if the water does not fall below 12-13 ºC. In other words, it works well in cold climates, but loses effectiveness in mild winters.
• How to use: Pour directly into the pool, distributing it homogeneously.

Solid winterizer (floating dispenser)

• Ideal for: pools larger than 40-45 m³.
• Advantages: Releases the product progressively.
• Greater resistance to warm temperatures (more tolerant than liquid in warm climates).
• Requires less intervention during the winter.
• Limitation: Not recommended for small pools, as it may release an excessive amount of product with respect to the volume of water.

General recommendation

• If your pool has polyester or reinforced sheet: always choose copper-free winterizer.
• If your pool is made of gresite, you can use both, but better without copper to avoid problems with the joints.
• If your pool is small (
• If your pool is large (> 40 m³) and you live in an area with mild winters: you can opt for the solid doser.

Professional advice Quimipool

For a perfect wintering, start with a thorough cleaning of the pool, adjust the pH between 7.2 and 7.6 and make sure the chlorine levels are balanced before applying the winterizer.

And remember: good winterizing is the key to saving money in the spring.