What is an effective way to reduce evaporation in outdoor pools?

An effective way to reduce evaporation in outdoor pools is by installing a pool cover or shade structure. This method creates a barrier between the water surface and the air, significantly limiting the exposure of the water to wind and sunlight, both of which are primary factors contributing to evaporation. A pool cover not only helps to maintain water temperature and reduce chemical loss, but it also keeps debris out, leading to less frequent cleaning and maintenance. Shade structures can also help by blocking direct sunlight from hitting the water, which further mitigates heat loss and minimizes evaporation.

In contrast, while using a solar heater might provide some benefits for heating the pool, it doesn't directly address evaporation. Constantly adding water may temporarily compensate for evaporative loss, but it doesn't actually prevent evaporation from occurring. A water absorption system, if in place, would be more focused on collecting excess water rather than reducing evaporation rates. Therefore, the installation of a pool cover or shade structure stands out as the most effective method for minimizing water loss due to evaporation.