Bubble Pool Blankets, UV Breakdown & 

Bubble pool blankets, also known as solar pool covers, are one of the most common pool covers in New Zealand. They help reduce evaporation, hold warmth in the pool and support heating systems like heat pumps.

But there is one thing many pool owners do not realise until it starts happening.

Bubble blankets are plastic products, and over time they break down.

In New Zealand, where UV levels are harsh, a standard bubble pool cover can become brittle, faded and flaky. Once the bubbles start splitting, peeling or shedding small plastic pieces into the water, the cover has reached the end of its useful life and should be replaced as soon as possible.

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Why Bubble Blankets Break Down

A bubble blanket spends its life doing a tough job. It sits directly on chlorinated pool water while being exposed to sun, heat, pool chemicals and constant rolling on and off the pool.

That combination slowly weakens the plastic.

Over time, the cover can become:

• brittle

• faded or cloudy

• cracked around the bubbles

• flaky on the surface

• thin and weak in high-use areas

• rough to touch

• full of small plastic fragments in the pool

Once this starts, the blanket is no longer performing properly. It can also become messy, leaving plastic pieces in the pool, skimmer box, filter basket and pool equipment.

Are Bubble Blankets Creating Microplastics in Your Pool?

When a bubble cover starts breaking down, the visible flakes are only part of the problem. As plastic becomes brittle and fragments, it can shed smaller particles into the pool water.

This is why old, damaged bubble blankets should not be left on the pool.

If your pool cover is flaking, peeling or leaving blue, clear or silver plastic fragments in the water, it is time to replace it. The cover is no longer protecting your pool properly, and it may be adding plastic waste back into the water you swim in.

The Real Job of a Pool Cover

The primary job of any pool cover is simple:

Retain heat and reduce evaporation.

Evaporation is one of the biggest causes of pool heat loss. A good pool cover slows that process down, helping your pool hold temperature overnight and reducing the workload on your heating system.

This is especially important for heat pumps. A pool heat pump can produce heat efficiently, but without a good blanket, much of that heat can be lost from the surface of the pool. In simple terms, a heat pump needs a pool blanket if you want it to work properly and cost-effectively.

Bubble Blanket vs Heat Guard Thermal Blanket

A bubble blanket is a lightweight plastic cover. It can work well when it is new, but it has a limited lifespan because of the material, pool chemicals and UV exposure.

A Heat Guard thermal blanket is different.

Heat Guard is designed as a more durable thermal pool blanket, focused on heat retention and long-term performance. It does not fail in the same way as a standard bubble cover, where bubbles collapse, crack and flake into the pool.

Like every pool cover, Heat Guard still has a lifespan. Any product sitting on a pool, holding heat, dealing with chemicals and being exposed to outdoor conditions will age over time. The difference is that Heat Guard is built for thermal performance and does not rely on fragile air bubbles to do the job.

When Should You Replace a Bubble Pool Blanket?

You should replace your bubble pool cover when you notice:

• bubbles collapsing or splitting

• plastic flakes in the pool

• the cover becoming brittle

• surface peeling

• the blanket becoming very thin

• reduced heat retention

• the cover tearing easily

• pieces collecting in your skimmer or filter basket

Once a bubble blanket starts breaking down, it usually gets worse quickly. At that point, it is better to replace it rather than let the plastic continue breaking apart in your pool.

Do You Always Need a Blanket?

A pool cover is still one of the best ways to retain heat and reduce evaporation. But if you want to reduce how heavily you rely on a blanket, pool solar heating is another smart option.

Pool solar heating uses free energy from your roof to put heat directly into the pool. This can help extend your swimming season and reduce the pressure on your blanket, especially during shoulder seasons and off-season periods when you want extra warmth without relying only on a heat pump.

Because the pool is receiving direct solar heat, you may not need to use the blanket as aggressively every day. That can help extend the useful life of your cover by reducing the amount of time it is exposed, rolled, unrolled and sitting under harsh UV.

The Best Pool Heating Setup

For most New Zealand pools, the best setup is not just one product. It is a system.

A smart pool heating setup can include:

• pool solar heating to add free heat from the roof

• a thermal blanket to hold that heat in the pool

• a hidden or easy-use roller system so the cover actually gets used

• automation or chlorination to keep the pool easier to manage

The goal is simple: heat the pool, hold the heat, reduce evaporation and make the system easy enough to use every day.

Bubble pool blankets have a place, but they do the pool easier to manage

The goal is simple: heat the pool, hold the heat, reduce evaporation and make not last forever. In New Zealand’s harsh UV conditions, old bubble covers can break down, flake and shed plastic into the pool.

If your bubble blanket is starting to peel, crack or leave plastic fragments behind, it is time to replace it.

For a longer-lasting solution, consider upgrading to a Heat Guard thermal blanket or pairing your pool cover with pool solar heating. That way, you can retain more heat, reduce evaporation, lower running costs and get more usable swimming time from your pool.

Heat it. Hold it. Hide it. PSH