Pools - Water Envelope at a Glance

The water evocation in the pool helps you to check the basin on a possible leak. If you feel that your pool loses more water than usual, knowledge about the daily water evidence will help you. You can compare the values and be on the safe side that way.

Average water loss through evaporation

Water evaporation is one of the reasons why you have to keep adding water to the pool. Water moves constantly and above all the water surface evaporates, which leads to constant loss. Modern pool systems are extremely safe and leakage rarely occurs, so little water is lost through evaporation. Evaporation is noticeable even in a hot tub without a cover.

Fortunately, you can roughly calculate how much water you will lose to evaporation, especially in summer. If the pool is used over the winter, the amount that evaporates is significantly reduced as long as the pool is not heated. A heated pool, on the other hand, allows more water to evaporate.

The average amount of evaporated water in Central Europe is between 5 and 10 l per m² per day. But this only means the surface of the water. This means that you only need the area of the pool to determine the average loss due to water evaporation. With a 20 m² pool you have to reckon with 100 to 200 liters of water loss every day, provided that it is warm summer days. Note that other factors affect the loss.

What affects water evaporation?

It is not just the sun and temperature that cause water to evaporate in the pool. There are numerous other factors that more or less reduce the amount of water. Water evaporates and is carried away by the wind. Calm and shady locations evaporate significantly less water. A cover can help keep water in the pool as it cannot escape and drip back into the pool even in warm temperatures. Other factors can be:

  • Hours of sunshine a day
  • Filter pump run time
  • Bath time
  • Air pressure, air temperature and humidity
  • Hydraulics
  • Frost protection and insulation

However, these factors are not of concern. If your pool is losing too much water for its size, you should check it for a leak instead.