For the best results in preventing algae, opt for a pool cover made of UV-stabilized polyethylene, polypropylene, or vinyl. These materials not only keep debris out but also block sunlight, which is essential for algae growth. It's crucial to keep the cover clean and free from leaves and debris, as this further helps in preventing algae during winter.
For winter pool covers, the most recommended colors are gray and tan. These colors not only complement most backyards but also resist UV fading and do not show dirt as prominently as other colors might.
One disadvantage of mesh security covers is that they allow water to pass through, which can lead to very dirty pool water when opening it in the spring. However, this cloudy/murky water usually clears up within 2–5 days of opening, requiring some effort to get the pool back to its normal condition.