Should I Remove My Solar Pool Cover in Winter?

Many pool owners assume that once winter arrives, it's best to leave the solar pool cover on and forget about it until spring. While a solar cover is fantastic during the swimming season, keeping it on your pool throughout winter may actually create more problems than benefits.

If you're wondering whether you should remove your solar cover during the cooler months, the answer for many Perth pool owners is yes. Here's why.

1. Winter Sun Isn't Strong Enough to Provide Significant Heating

Solar pool covers work by trapping heat generated by the sun. During summer, this can dramatically reduce heat loss and increase water temperature.

In winter, however, the sun's intensity is much lower, daylight hours are shorter, and overnight temperatures are colder. The small amount of heat gained during the day is often lost overnight, making the cover far less effective as a heating tool.

For many pools, the cover simply isn't providing enough benefit to justify leaving it on continuously.

2. Rainwater and Debris Can Create Water Quality Issues

Winter often brings heavy rain, leaves, dirt, and organic debris. When a solar cover remains on for extended periods, debris can accumulate on top and around the edges of the cover.

As rainwater sits on the cover, contaminants can eventually find their way into the pool, affecting water balance and increasing the likelihood of algae growth.

Removing the cover allows rainwater to naturally circulate and makes it easier to monitor and maintain your pool.

3. Reduced Airflow Can Encourage Algae Growth

One of the biggest reasons we see green pools during winter is poor circulation and reduced sunlight penetration caused by pool covers being left on for months at a time.

A solar cover creates a warm, sheltered environment where algae can thrive if water chemistry isn't perfectly maintained. Combined with reduced filtration run times during winter, this can quickly lead to cloudy or green water.

Removing the cover helps improve airflow and allows you to visually monitor your pool's condition.

4. Your Pool Needs Regular Inspection

Out of sight often means out of mind.

When a solar cover stays on all winter, many pool owners stop regularly checking their water quality, equipment, and pool condition. Small problems such as low chlorine levels, equipment faults, or algae growth can go unnoticed until spring.

By removing the cover, you're more likely to keep an eye on your pool and address issues before they become costly repairs.

5. Extend the Life of Your Solar Cover

Solar covers aren't cheap. Constant exposure to winter weather, rain, UV rays, and wind can accelerate wear and tear.

If you don't plan on using your pool much during winter, removing, cleaning, drying, and properly storing your solar cover can significantly extend its lifespan and help ensure it's ready for the next swimming season.

6. Trapped Chemical Gases Can Damage Your Pool and Equipment

One of the most overlooked issues with leaving a solar pool cover on for extended periods during winter is the build-up of chemical gases beneath the cover.

As chlorine works to sanitise your pool, it naturally produces chemical by-products and gases. When a pool is uncovered, these gases dissipate harmlessly into the atmosphere. However, when a solar cover remains on the pool for weeks or months at a time, the gases can become trapped between the water surface and the underside of the cover.

Over time, this concentrated chemical environment can lead to several costly problems, including:

• Premature deterioration of the solar cover itself
• Increased brittleness and cracking of pool cover bubbles
• Damage to pool blankets and cover rollers
• Accelerated corrosion of stainless steel fixtures and fittings
• Premature wear on plastic components and pool equipment
• Fading and deterioration of pool surfaces and surrounds
• Strong chemical odours when the cover is eventually removed

These trapped gases can be particularly aggressive in pools with high chlorine levels, salt chlorination systems, or pools that are not regularly monitored during winter.

By periodically removing the cover or storing it away during periods of low pool usage, you allow these gases to escape naturally, helping to protect both your pool equipment and your investment in the cover itself.

Protect Your Pool Investment

A solar cover is designed to save you money, not create expensive maintenance issues. Regularly ventilating your pool by removing the cover, especially during winter, can help prevent chemical gas build-up, improve water quality, and extend the life of your pool equipment and accessories.

This is actually one of the strongest reasons pool professionals recommend removing or regularly venting solar covers during winter, as the damage caused by trapped chloramines and other chemical gases often goes unnoticed until expensive components begin to fail prematurely.

When Should You Keep Your Solar Cover On?

There are some situations where leaving the cover on may still make sense:

• You have a heated pool.

• You use your pool regularly throughout winter.

• You have a pool heat pump and want to maximise efficiency.

• You're actively managing water chemistry and circulation.

In these cases, a solar cover can still help reduce heat loss and lower heating costs.

The Bottom Line

A solar pool cover is one of the best investments you can make during the swimming season, but winter conditions are different. For many Perth pool owners, removing and storing the cover during winter can improve water quality, reduce algae risk, make pool maintenance easier, and extend the life of the cover itself.

If you're unsure about the best winter maintenance strategy for your pool, the team at Pool World Australia can help. Whether you need water testing, pool servicing, equipment advice, or a winter maintenance plan, we're here to keep your pool healthy all year round.

Need Help Maintaining Your Pool This Winter?

Contact Pool World Australia today for expert pool care advice, water testing, equipment checks, and professional pool servicing throughout Perth.