How to winterproof your pool

Why winterproofing your pool matters

A swimming pool is a long-term investment, and protecting it through the colder months is essential for keeping it in prime condition. In the UK, low temperatures, frost and debris can all take their toll. Without the right preparation, equipment may be damaged, water quality can deteriorate, and repairs can become costly. This guide explains how to winterproof your pool step by step, covering everything from seasonal cleaning and chemical treatments to choosing the right winter cover. With proper planning, you can safeguard your pool during winter and ensure it reopens smoothly when warmer weather returns.

Winterisation is not simply a precaution, it is a vital part of responsible pool ownership. Frozen pipes, algae growth, and structural strain from ice are all risks that can be prevented with the correct measures. Taking the time to close your pool properly protects finishes, extends the lifespan of equipment and reduces the need for expensive spring cleaning. Ultimately, winterproofing ensures your pool remains safe, clean, and ready for use as soon as the season changes.

Preparing your pool before closing

The first stage of winterproofing is a thorough clean. Brush the pool walls, vacuum the floor, and skim away all leaves and debris. Once clear, balance the water’s pH, alkalinity and calcium hardness. Entering winter with clean, stable water reduces the risk of staining or algae growth during the months ahead. Depending on the pool type and the cover used, the water level may also need to be lowered slightly to prevent freezing damage around the skimmers. These initial winter pool checks provide the foundation for effective closure..

The right chemicals for winter pool care

One of the most common questions pool owners ask is: what chemicals should I put in my pool in winter? The process usually involves applying a chlorine shock treatment to eliminate bacteria, followed by a long-lasting algaecide to prevent growth, and finally adding a stain and scale inhibitor to protect surfaces. Many owners also choose a complete winterising kit to keep the balance stable throughout the colder months. While this can be done yourself, professional input ensures precise dosing, avoiding the risks of under-treatment or unnecessary expense.

Covering your pool for winter

The winter pool cover is the final and most important protective layer. There are several types to consider:

• Safety covers: These are securely anchored and can support significant weight, making them the best choice for families with children or pets.
• Mesh covers: These allow water to pass through but keep out leaves and debris, reducing the weight on the cover.
• Solid winter covers: These block out all sunlight, which is highly effective at preventing algal growth.

A high-quality cover that is durable, secure and resistant to debris is a worthwhile investment. At Lagoon Pools, we specialise in solutions that integrate safety and aesthetics, ensuring your pool remains a beautiful and secure feature of your garden year-round.

Equipment and ongoing checks

Protecting your pool’s mechanical systems, pumps, filters and heaters also need attention. These should be drained, and the pipework cleared of water to avoid freezing and cracking. Throughout winter, occasional checks are recommended, particularly after heavy rain or wind, to ensure the cover is secure and water levels remain stable. For homeowners seeking complete peace of mind, Lagoon Pools offers seasonal maintenance services, managing the process from start to finish and ensuring every detail is covered.

Winter pool care with Lagoon Pools

At Lagoon Pools, we believe winterproofing is about more than just protection, it’s about ensuring your pool remains safe, efficient and ready for every season. By preparing properly, you avoid costly damage over the colder months and make reopening in spring far simpler. From professional chemical treatments to secure, high-quality covers, our team provides tailored solutions that balance safety with design. With Lagoon Pools, your pool is cared for all year round, providing you with peace of mind, regardless of the weather.

Frequently asked questions

How do you winterproof a pool in the UK?

Winterproofing in the UK involves thoroughly cleaning the pool, balancing the water chemistry, adding a winterising algaecide, draining the equipment and pipework to prevent freezing and fitting a secure, high-quality winter cover.

What chemicals should I put in my pool for winter?

Before closing, you should typically use a chlorine shock treatment to kill any bacteria, followed by a long-lasting algaecide to prevent algae growth. A stain and scale inhibitor is also recommended to keep surfaces clean.

Should I cover my pool in winter?

Yes, covering your pool is essential. A proper winter cover keeps out debris, blocks sunlight to prevent algae growth and, most importantly, acts as a crucial safety barrier for children and pets.

How often should I check my pool during winter?

It’s a good idea to check your pool every few weeks, and especially after heavy storms or wind. Check that the cover is still securely in place and that the water level hasn’t risen or fallen significantly.

What happens if I don’t winterise my pool?

If you don’t winterise your pool, you risk serious and expensive damage. Freezing water can crack pipes, pumps and filters. Without chemical treatment, you will likely open your pool in the spring to find green, algae-filled water that requires extensive and costly cleaning.