Evaporation is when liquid turns into vapor, and is the largest single cause of water loss in outdoor swimming pools. The rate of evaporation can vary greatly, depending on the pool's surface area, water temperature, outside air temperature, humidity, and wind speed on the pool surface.
Depending on where you live, evaporation rates tend to be at their highest in the evening/early morning (when temperatures change rapidly). Rates are also increased dramatically on a windy day - even a gentle breeze can double evaporation rates!
It is not uncommon for an average sized backyard pool to lose 60,000 litres of water a year through evaporation. If you would like to know just how much water YOUR pool is losing, visit the Bureau of Meteorology website and select your town. To work out how much water you have lost over the past year, take the evaporation rate less any rain fall which gives you the actual water loss.
The most effective way to stop evaporation is to use a pool cover. While all pool covers will help in some way, ABGAL's Oasis 400 and 500 micron solar covers have been independently tested, and proven to prevent up to 99.84% of evaporation.