Home » What do microns mean? Pool cover microns explained.

What do microns mean? Pool cover microns explained.

Micrometer After doing a little research on swimming pool covers, you’ll see that here in Australia a lot of pool covers have “400 microns” or “500 microns” in the specifications.

But what does the term microns mean in relation to pool blankets?

Pool Cover Microns Explained

Micron is the measurement used to measure the thickness of a swimming pool cover. A micron is just a unit of measurement and is equal to 1/1000th of a millimetre. In Australia pool covers generally come in 250, 300, 400, 500 and 600 microns.

A 400 micron pool cover is equivalent to 0.4mm in thickness. The height of the bubble is not included in the measurement- just the thickness of the material.

What Blanket Thickness Do I Need?

In general, thicker blankets last longer than thinner covers.  The disadvantage of a thicker blanket is they’re heavier, less flexible and harder to handle.  However, generally the advantages of a slightly thicker pool cover greatly outweigh the negatives.

400 & 500 Micron Solar Pool Covers

These covers are a good choice for people who regularly take their cover on and off, have a roller and want a longer lasting cover (3 to 6 years).

These covers resist tearing, sun damaged and chemical damage better than thinner pool covers.

250 Micron Solar Pool Covers

Some people do however prefer a thinner pool cover and choose a 250 micron cover. These covers often only last one season. They are a good choice if you’re on a budget, don’t have a roller and don’t mind replacing it regularly. They are however, more prone to tearing and break down quicker.

Covers that last longer, tend to get very dirty and develop rips and tears in them after a few years. Although this doesn’t really affect the performance, it doesn’t look attractive. If you like to keep your cover looking nice, then buying a thinner cover and replacing it regularly might be for you.

600 Micron Pool Blankets

These blankets are generally as thick as they come. They can be used for residential and domestic use.  They are more expensive since they are thicker but last even longer (3 to 8 years).

Recommended Products

Swimming Pool Covers

Related Reading:
Pool Covers: What’s the Difference Between 400 & 500 Micron?
Will a pool cover eliminate cleaning?
Do pool covers really heat the water?

4 thoughts on “What do microns mean? Pool cover microns explained.”

  1. When the blanket is on and the sun is out what is the best method to warm the pool? Should you run the pool filter to move the water around or leave the pool to bake under the solar blanket?


    • It’s a tricky question as it depends on the wind, ambient air temperature and the water temperature. Pool covers reduce evaporation which is the biggest cause of heat loss in a swimming pool. When it’s sunny, you can try leaving the cover on with the pump running to circulate the water.

    • It will depend on the weather. A couple of days of full sun in summer with the pool cover on will raise the pool temperature. You’ll find a pool cover won’t dramatically increase the temperature but it will certainly make a difference. It will also make a big difference to your pool if you have pool heating. It will retain the heat much better and make for a much more efficient heating system.


Leave a comment