Reduce Evaporation: Top Tips to Save Pool Water & Money
As a pool owner, few things are more frustrating than walking out to your backyard oasis only to find the water level has dropped significantly overnight. You just filled it up a few days ago, and now the skimmer is sucking air again. While your first instinct might be to panic about a leak, the culprit is often much more subtle: evaporation.
Water conservation isn’t just about being eco-friendly; it is about saving money. Every gallon of water that evaporates from your pool takes your hard-earned chemicals and heat with it. You aren’t just refilling the water; you are re-balancing the chemistry and re-heating the pool, driving up utility bills and maintenance costs.
Fortunately, you don’t have to accept this water loss as a fact of life. With help from Aqua Leisure Pools and Spas, the right strategies and a few adjustments to your maintenance routine, you can significantly reduce evaporation and keep your water where it belongs — in the pool.
The Science of Evaporation: Why Your Pool Loses Water
To effectively fight evaporation, it helps to understand why it happens. Evaporation occurs when liquid water turns into vapor. In a swimming pool, this process is accelerated by three main factors: heat, wind, and humidity.
When the sun beats down on your pool, the water molecules gain energy and move faster, eventually escaping the surface as gas. This is why heated pools lose water faster than unheated ones. However, wind is often an even bigger factor. A breeze blowing across the surface of the water acts like a blow dryer, stripping away the layer of humid air sitting right above the water and replacing it with drier air, which sucks up more moisture.
Lastly, the humidity level plays a role. In dry climates or during dry spells, evaporation rates skyrocket because the air is thirsty for moisture. While you can’t control the weather, you can control how your pool interacts with it.
Top Strategies to Reduce Evaporation
The most effective way to save water is to create barriers between your pool water and the elements. Here are the most proven methods to keep your water levels stable.
1. Power of Pool Covers
If you do only one thing to save water this season, invest in a pool cover. According to industry studies, using a physical pool cover is the single most effective method for water conservation, potentially cutting water loss by up to 95%.
A physical barrier, such as a solar blanket (bubble cover) or an automatic safety cover, stops the wind from hitting the water and traps the moist air underneath, preventing it from escaping into the atmosphere. Solar blankets have the added benefit of trapping heat from the sun, which can reduce your heating costs simultaneously.
For those who find taking a physical cover on and off to be too much of a hassle, liquid solar covers are an excellent alternative. These products create a safe, invisible molecular barrier on the surface of the water. While not quite as effective as a physical sheet of plastic, they still significantly reduce evaporation by suppressing the surface activity of the water molecules.
2. Managing Water Features
Fountains, waterfalls, and deck jets look beautiful and add a relaxing ambiance to your backyard. However, they are also massive contributors to water loss.
These features work by spraying water into the air, which breaks it up into droplets. This process, known as aeration, drastically increases the surface area of the water exposed to the heat and wind. Essentially, running a waterfall is like trying to evaporate water on purpose.
To reduce evaporation, keep these features turned off when you aren’t actually using the pool or entertaining guests. If you have them on a timer, consider reducing the runtime to the minimum amount necessary to keep the plumbing flushed.
3. Lowering the Temperature
There is a direct correlation between your pool’s temperature and its evaporation rate. The warmer the water is compared to the air temperature, the faster it will evaporate.
If you use a pool heater, consider turning the thermostat down by a few degrees. Even a small adjustment can make a noticeable difference in water retention. Additionally, if you aren’t using the pool for a few days, turn the heater off completely. Not only will you save water, but your gas or electric bill will thank you.
4. Creating Windbreaks
Wind is a silent thief. A wind of just 7 miles per hour can increase evaporation losses extensively. If your pool is located in an open area with a constant breeze, you are losing gallons of water every hour.
You can combat this by installing windbreaks. This doesn’t mean you need to build a brick wall around your patio. Strategic landscaping, such as planting dense shrubs or a row of trees, can divert airflow up and over the pool.
Fencing and privacy screens are also effective options. By creating a calm zone over the water’s surface, you reduce the “blow dryer” effect and keep the humidity locked in near the water.
5. Is it Evaporation or a Leak? The Bucket Test
If you feel like you are losing more than a quarter-inch of water per day, despite your best efforts to reduce evaporation, you might have a leak. Before calling a professional, you can perform a simple “bucket test” to confirm.
- Fill a 5-gallon bucket with pool water about two-thirds full.
- Place the bucket on the first or second step of the pool (ensure the water level inside the bucket matches the water level outside the bucket).
- Mark the water level on the inside of the bucket and the outside of the bucket with a piece of tape or a marker.
- Wait 24 hours.
If the water level in the pool (outside mark) has dropped more than the water level inside the bucket, you likely leak. If they dropped the same amount, it is just evaporation.
6. Chemical Balance and Filtration
Believe it or not, your water chemistry affects conservation. When your water chemistry is out of balance, you may have to drain and refill the pool to correct it, or backwash your filter more frequently to clear up cloudy water.
Maintain a proper pH level between 7.4 and 7.6. Crucially, keep an eye on your cyanuric acid (stabilizer) levels, aiming for 30–50 ppm. The stabilizer protects your chlorine from the sun, but if the levels get too high, the only way to lower them is to drain water from the pool.
Furthermore, consider your filtration method. Sand filters require backwashing, which dumps hundreds of gallons of water down the drain. Cartridge filters, on the other hand, are cleaned by spraying them off with a hose, which uses significantly less water.
7. Smart Refilling Habits
When you do need to add water to the pool, try to do it at night or early in the morning. Refilling during the heat of the day means some of that new water will evaporate before it even mixes with the rest of the pool. It’s a small change that adds up over the course of a summer.
Save Water and Enjoy Your Swim
Managing a pool doesn’t have to be a constant battle against the elements. By using covers, managing your water features, and keeping your equipment in top shape, you can drastically reduce evaporation. This leaves you with more money in your pocket and more time to enjoy the water with your family.
If you are a pool owner in Northeast Pennsylvania (NEPA) and need assistance with leak detection, safety covers, or general maintenance, we are here to help.
Contact Aqua Leisure Pools and Spas today to schedule a service or discuss the best cover options for your backyard oasis.
Posted by Aqua Leisure Pools & Spas in Pools