How to Spot and Prevent Algae Blooms as Temperatures Drop and the Clocks Go Back

As the days get shorter and temperatures begin to fall, your pool still needs some attention. Cooler weather doesn’t stop algae from growing. In fact, slower water circulation, reduced chlorine levels and an increase in organic debris can create ideal conditions for algae to take hold.

By spotting the early signs and acting quickly, you can prevent a full-blown bloom and avoid a major cleaning job when spring arrives.

Recognising the early signs of algae

Early detection makes all the difference. Look out for:

• Green or cloudy water, even a light haze can be an early warning sign
• Slippery or slimy surfaces on pool walls or steps
• A strong chlorine smell, which often indicates a chemical imbalance rather than cleanliness

Catching these signs early means the problem can be tackled before it spreads.

Keeping the water moving

Even if your pool isn’t in regular use, it’s important to keep the water circulating. Run your pump for a few hours each day to:

• Prevent stagnant water
• Avoid pockets where algae can thrive

Consistent movement keeps your pool water healthier and helps your chemicals work more effectively.

Maintaining balanced water

As temperatures drop, pH and chlorine levels can still fluctuate. Regular testing ensures your pool remains protected against algae growth throughout autumn and winter.

The team at Penguin Leisure can carry out seasonal chemical checks to make sure your water chemistry stays balanced and your pool remains in top condition.

Cleaning the pool regularly

Even when you’re not swimming, a bit of regular maintenance goes a long way.

• Brush down pool walls and vacuum weekly to remove biofilm build-up
• Use a leaf net or pool cover to keep out debris and organic matter

This simple routine helps maintain water clarity and reduces the workload when it’s time to reopen your pool fully.

Keeping your pool ready for next season

If you’ve noticed cloudy water or any early signs of algae, don’t leave it until spring to take action.

Contact Penguin Leisure for an autumn pool health check to keep your water clean, clear and ready for next season. And if you’re thinking ahead to improving or refurbishing your pool area, PL Construction can help with expert design and build services that make ongoing maintenance easier and more efficient.