Liquid solar cover is another option that homeowners can use in defense of their pool temperature. These products come in bottles and are poured directly into the pool, or the skimmer on the side, in an effort to pull the solution directly through the pump for a more spread out application across the water. Liquid solar cover products are not as effective as a physical barrier, and you may need to apply multiple treatments in order to achieve the desired effect at certain times of the year. Therefore, liquid augmentation products might be a good backup solution, or used as an addition, to other strategies for maintaining consistent heat in the pool.
These liquid products make use of an alcohol solution to form a barrier between the air above the pool and the water within it (via Swim University). Alcohol and water have differing densities, and alcohol will float on top of a mixed solution that incorporates water. As such, an alcohol product can be used to form a natural barrier in the same way that physical solar covers or rings do. Even though a liquid cover won’t be as effective as a physical one, these products can reduce evaporation of pool water by as much as 85%, making them a useful option regardless of how they stack up against other choices.