Pool Cover - Bubbles Up Or Down?

Pool Cover - Bubbles Up Or Down?

Some types of pool covers, mostly known as solar covers or pool blankets, have a unique texture that resembles bubble wrap.

This design is specifically engineered to trap the energy generated by sunlight within your pool, warming your water and creating a more pleasant experience.

In order to get the most out of your pool cover, you need to use it properly. Knowing whether to keep your pool blanket bubbles up or down can help you maximise the water warming effect of your cover.

Pool Blanket: Which Side Up?

Determining if you should put your pool cover bubbles up or down depends on the effect you are trying to achieve. If you are trying to increase the temperature of your pool’s water, you should always have the bubble side facing the water.

If you are only trying to maintain the temperature of your pool water, and are using the blanket as a night-time cover to prevent heat loss, it is equally effective either way.

It is only when you are trying to generate heat using sunlight that the bubble side of your pool’s cover should be facing down into the water.


The bubbles on your pool cover should be facing your pool’s water in order to produce an increase in water temperature. When it is turned the other way around, the cover may still work to keep heat from escaping the water, but will not be efficient at increasing your water’s temperature.

Do you have any questions about if your pool cover bubbles go up or down? Leave us a comment down below, we’d love to help!

Also, find out whether to leave your solar cover on the pool during the day or not!

Louis from Pool Advisor


A chemical engineer by trade, Louis is committed to debunking myths in the pool industry by explaining the underlying chemistry and making it accessible to all.