One popular option is solar covers. These plastic tarps, which sometimes feature light metal coatings on the bottom, can be used for in-ground and above-ground pools as well as spas and offer a number of advantages for heat retention.
First, a cover helps keep the heat already in the water from escaping. Most covers feature a bubble wrap-type design that works as an insulator to trap the heat in the swimming pool. As temperatures fall at night, the cover insulates the water to protect its warmth.
The cover’s true advantage is its ability to apply solar energy accumulated through the day to the water. Even on the sunniest, hottest days very little of the sunlight that hits your pool water actually heats the water. A solar cover will absorb and store this sunlight as heat. The heat from the sunlight is then transferred to the pool water. Some covers make use of a thin undercoating of aluminum, a recent innovation which conducts the heat throughout the pool, much like a metal pot helps speed up the cooking process.
Even on sunny but cool days, this can result in a real and sustainable difference in water temperature. For in-ground pools, a cover typically provides an increase of five degrees Fahrenheit in 12 hours alone.
|A cover also helps by reducing evaporation, an advantage particularly helpful for spa owners. Warm water doesn’t do any good once it dissipates, and a covering greatly slows this process down. By reducing water evaporation, you reduce chemical evaporation; saving you time and money retreating water.|
|Traditional Solar Blankets
These tarp like covers are made for above ground and in ground pools and spas; and cover the entire water surface. They provide the best results when it comes to preventing heat loss, heating the water and reducing water and chemical evaporation; in addition to preventing dirt and debris from getting into pool water. This type of cover can be easily applied and removed with a cover reel.
|Heat Squares or Sun Rings|
These types of covers are great for all types of pools - rectangle, round, non-traditionally shaped pool, in ground and above ground because pieces are bought individually. You can cover the entire pool during non-use, or just sections of the pool. Plus, they're quick and easy to use, remove and store.
|Liquid Solar Blankets
An invisible layer of non-toxic, biodegradable film on top of the water. This type of coverage is helpful for preventing pool heat loss and reducing evaporation, but are considered less effective compared to a full cover.
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