Why dont they make pool covers black instead of blue the cover would absorb more heat than blue?

While it is true that black absorbs more heat than blue, using a black pool cover is not ideal for several reasons:

Increased Water Temperature: A black pool cover would indeed absorb more heat from the sun, leading to a higher water temperature. However, this may not be desirable in many cases. In hot climates, the pool water can become uncomfortably warm, making swimming less enjoyable. Additionally, higher water temperatures can contribute to increased evaporation, resulting in water loss and higher chemical costs to maintain proper water balance.

Structural Damage: The increased heat absorption by a black pool cover can cause damage to the pool structure, especially above-ground pools. The high temperatures can make the pool material more susceptible to warping, cracking, and fading over time. This can shorten the lifespan of the pool and require costly repairs or replacements.

Algae Growth: Black pool covers create a warm, dark environment that is ideal for algae growth. Algae thrive in warm, moist conditions and can quickly multiply, turning the pool water green and murky. This can necessitate frequent cleaning and chemical treatments to control algae growth, adding to the maintenance burden and expense of pool ownership.

Safety Concerns: Dark-colored pool covers, including black ones, can make it more difficult to see objects in the pool. This can pose a safety hazard, particularly for children and those with impaired vision. A blue or lighter-colored pool cover provides better visibility, allowing for easier monitoring of the pool and helping to prevent accidents.

Aesthetics: Many pool owners prefer the look of a blue pool cover as it complements the blue water and creates a visually appealing backyard oasis. A black pool cover may not be as aesthetically pleasing and can give the pool area a darker, more somber appearance.

Considering these factors, blue pool covers are generally preferred over black covers to maintain a comfortable pool temperature, prevent structural damage, minimize algae growth, enhance visibility and safety, and provide a more aesthetically pleasing appearance.

It's worth noting that pool owners can opt for solar pool covers, which are specifically designed to absorb and retain heat. These covers are typically made of a translucent material that allows sunlight to pass through and warm the water while preventing excessive heat loss. Solar covers are a great choice for extending the swimming season and saving energy on pool heating costs.