The wind will undoubtedly have an effect on pool water, as wind can blow water particles and cause speedy evaporation. Other windy regions include the Great Plains, the Great Lakes and most coastal locations. If wind is not the problem, a lack of humidity may be.
The central continental United States is known for its dryness, while the East and West coasts, the Great Lakes, Florida and northern Idaho are known for more humid climates. Humidity refers to the amount of moisture in the air- when air is moist, water molecules tend to stay in place, rather than infiltrating the already water-laden air. As a result, humid air keeps water in the pool, while dry air allows pool water to evaporate.
Non-humid areas also tend to be sunlight-intensive, providing another reason for pool water loss. When the sun's rays beat down most strongly, water molecules evaporate and dry up, converting to air molecules - a perfect match for the area's non-humid air!
As a result, people in sunny, non-humid areas, especially the southwestern United States, can experience more pool water evaporation. This means, as a pool owner, you lose a measurable amount of pool water every day through evaporation.
Several thousands of gallons of water per year for an average residential pool, in fact. There are multiple conditions that govern the rate of evaporation for any body of water, including swimming pools. For evaporation, anywhere between 2 millimeters to 2 inches per week is about what you should expect in terms of pool water loss. This largely depends on the conditions we mentioned above which are mostly governed by the climate you live in, but it also has a lot to do with the unique conditions of your swimming pool.
There are pool evaporation calculators you can use, and they work pretty well if you can feed them with accurate information. You could simply mark the side of your pool to the same effect, but using a bucket allows you to remove many of the outside factors mentioned above, and get the most accurate reading on evaporation alone.
However, water conservation is still important for many pool owners, and there are effective strategies to help your pool more efficiently hold onto the water it has. Plain and simple, it comes down to evaporation. Evaporation occurs when the pool surface is exposed to air and wind. The water molecules rise up from the top of the water, form into vapor, and escape into the atmosphere. Evaporation also occurs on cool nights, when a heated pool loses water volume as the water forms into mist in the chilly air.
This is bad news for your pool: Depending on weather conditions like heat, wind, sunlight, and humidity, your water level can drop a quarter of an inch each day. Fortunately, there are a number of ways to combat evaporation.
Pool owners may be surprised to learn that even after the sun goes down and the temperature drops, evaporation can strike! If present, these factors are important to research and address. This article is on saving water, but it focuses only on tactics to slow evaporation. First and foremost: Use a pool cover! Covers can dramatically slow the pace that water evaporates—particularly on hot days and cold nights.
Not only are pool covers effective, they offer other benefits. Along with keeping more water in the pool, they keep more heat inside, reducing energy demands on your pool equipment. They also keep your pool cleaner, and depending on the type of cover, keep it safer as well. With the wide array of models and price points available, a cover can work for most every pool and most every budget.
You can invest thousands in a high-end automatic cover that extends across the pool with the push of a button. Or, you can drop about a hundred bucks for a lightweight solar blanket. These thin plastic blankets float on the pool surface and go onto the pool manually or with a reel. Bonus tip: In some municipalities, water districts offer coupons or other incentives toward the purchase of a swimming pool solar blanket.
Information about these offers—and sometimes an on-line coupon—is provided right on the water agency website. The bottom line is that covers work really, really well.
If you want to dramatically slow the march of evaporation on your pool-water level—and you do nothing else—adding a cover will make a world of difference. Although not effective as a genuine pool cover or solar blanket, a liquid solar blanket can provide some help.
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