When temperatures drop, many pool owners assume maintenance can take a back seat. But neglecting your pool during the colder months is one of the quickest ways to end up with green, algae-filled water come spring.

The good news? With a few simple steps, you can keep your pool clean, clear, and ready to go year-round.

Why Pools Turn Green in Winter

Even in cooler weather, algae can still grow—just more slowly. Reduced filtration, inconsistent chemical levels, and debris buildup create the perfect environment for algae to take hold.

Shorter days and less usage often mean pools are overlooked, allowing problems to build up unnoticed.

1. Keep Your Water Balanced

Maintaining proper water chemistry is essential, even in winter.

• Chlorine: Keep levels consistent to prevent algae growth

• pH levels: Aim for 7.2–7.6

• Alkalinity: Helps stabilise pH and improve water clarity

Regular testing (every 1–2 weeks) will help you stay ahead. 

2. Don’t Turn Off Your Filtration

It might be tempting to switch off your pool pump to save energy, but circulation is key to preventing stagnant water.

• Run your pump daily (even if reduced hours)

• Ensure water is moving to stop algae forming

A few hours a day is usually enough during winter, depending on your pool size and environment.

3. Remove Debris Regularly

Leaves, dirt, and organic matter break down in your pool and feed algae.

• Skim the surface weekly

• Empty skimmer and pump baskets

• Vacuum the pool as needed

If you want to make life easier, consider investing in a pool robot to handle the cleaning for you. It’s a simple way to maintain consistency without the manual effort—especially during colder months when motivation can drop.

4. Use a Winter Algaecide

Adding a preventative algaecide can give you extra protection during colder months.

This is especially helpful if:

• Your pool gets a lot of shade

• You live in a damp or humid area

• Maintenance may be less frequent

A product like BioGuard AlgiGuard is ideal for ongoing algae prevention, helping keep your water clear even when your pool isn’t getting as much attention.

5. Shock Your Pool Occasionally

Even in winter, shocking your pool helps eliminate contaminants and keeps water fresh.

• Shock every 4–6 weeks

• Do it after heavy rain or debris buildup

6. Cover Your Pool

A good-quality pool cover is one of the best investments for winter maintenance.

Benefits include:

• Keeps out leaves and debris

• Reduces sunlight exposure (which algae need to grow)

• Helps retain heat and chemicals

7. Stay Consistent

The biggest mistake pool owners make in winter is inconsistency. Small, regular maintenance is far easier (and cheaper) than fixing a green pool later.

Keep Your Pool Swim-Ready All Year

A little effort during the colder months goes a long way. By staying on top of water balance, circulation, and cleanliness, you’ll avoid the headache—and cost—of bringing a green pool back to life.

At The Spa Shop, we carry a wide range of products and can help you choose the right solution to keep your pool in perfect condition year-round.

We also offer free water testing in-store, so you can get accurate advice and the right treatment plan to keep your pool clear and healthy—no guesswork needed.