swimming pool evaporation

How to Conserve Water in Your Pool

It’s that in-between time of year again in Florida – too warm, too cold, or just right? Depends upon which day it is – and you may be noticing an associated drop in your pool water levels.

No need to panic – in fact, from October to May, it’s perfectly reasonable to assume your Florida pool may lose a quarter inch of water a day to evaporation (although more than that may spell trouble, and you should have a pool professional check for leaks).

That’s because evaporation is often weather-related, with two factors typically contributing: temperature and humidity. As area residents can well attest, humid air is packed with water, whereas dry air has the capacity to absorb it. And when temperatures shift from daytime warmth to cool or even cold overnight, it’s simply a fact: your pool water will evaporate.

swimming pool evaporation

A variety of non-weather factors come into play too:

  • What size is your pool?
    The bigger the pool, the more surface area, which equals more evaporation.
  • Is your pool more frequently in sun or shade? Is it screened or not?
    Direct sunlight will speed the evaporation process.
  • Do you use a pool cover?
    A pool cover that is properly installed can prevent up to 95% of evaporation (and they are an added safety feature as it is difficult to fall into the water when the cover is in place).
  • Is the area surrounded by landscaping or some other windbreak?
    Even a gentle breeze can more than double the evaporation rate by removing the insulating layer of warm, moist air directly above the pool surface.
  • Is your pool used frequently, and by whom?
    Daily use speeds evaporation, and kids and pets tend to splash more.

The good news is, you can work around some or all of these factors with tips and tricks like these:

  • Try to limit filter backwashing – which surprisingly can use up to 200 gallons of water at one time – by keeping your pool as clean as possible.
  • Do not leave running water unmonitored when re-filling your pool. On average, the flow from your backyard hose will be about 5 gallons per minute, so don’t leave it unattended.
  • The highest evaporation rates occur when the differences between water and air temperatures are the greatest, so cover your pool overnight.
  • Turn off waterfalls and fountains when you aren’t using the pool area.
  • Limit your use of a pool heater, if you have one.