How do you choose a good swimming pool cover? Here is some infomation to help you choose.
Developed from the same technology as bubble wrap, pool covers are made from two layers of plastic one flat layer on top bonded to a bottom layer with air bubbles in it. The air bubbles mean that the cover will float on the water. Pool covers are often refered to as bubble covers. The first pool covers were coloured blue because it seemed a sensible colour to choose.
Research on pool covers soon discovered that not only did they keep the heat in the pool by stopping evaporation but by a “greenhouse” effect they could also heat the surface of the water. This lead to the covers being refered to as Solar Covers. It was then discovered that if you made the bottom, bubble, layer of the cover in silver plastic then the silver reflected the heat back in to the pool like silver foil on a roast joint. This lead to them also being called heat retention covers. Because of the blue top and the silver underside they are mostly known as blue/silver covers.
Another consideration is the thickness of the plastic that the layers are made from. The thickness of the plastic is measured in microns. One micron is 1,000th of a milimetre. Some cheap covers are 100 or 200 microns thick but the standard thickness for our covers is 400 microns or 0.4mm. So our standard cover is made from 400 micron material with a blue top layer and sliver bottom layer and is refered to as a “400 micron blue/sliver”.
The next level up in quality is a cover made from 500 micron thick plastic. 500 micron covers come with a blue top layer and a gold bottom layer. Hence they are refered to as a “500 micron blue/gold“. The thicker material means these covers are harder wearing and they are heavier too. They do not retain much more heat than the 400 micron blue/silver but they do have a longer warranty. If you have a big pool the extra weight, 25% more, of this cover may be an important consideration for you.
All bubble covers for swimming pools have chemicals in them to protect against ultra violet light. The 400 micron blue/silver has a 3 year pro rata warranty and the 500 micron blue/gold’s is 4 year.