Covall 21ft Round Above-Ground Pool Cover for 17–18ft Pools — UV-Resistant Silver/Blue, Heavy-Duty PE with Winch & Cable

The COVALL 21ft Round Above Ground Pool Cover is a UV-resistant, heavy-duty PE cover that fits 17–18ft pools and keeps debris, sun damage, and weather out of your pool year-round.

Designed for above-ground pools, this silver/blue COVALL cover combines tightly woven, high-density polyethylene construction with practical installation hardware so you can protect water quality, cut maintenance time, and extend the life of pool surfaces. The material resists sun, rain, wind and snow while the included winch and cable secure the cover to the pool frame for reliable performance through changing seasons.

How does this cover stand up to sun, wind and weather?

The cover uses a thicker, tightly woven PE fabric that’s treated to resist UV degradation and repel water. That construction reduces tearing and helps prevent pooling water and debris from damaging the material over time.

• High-density woven PE resists UV rays and reduces fading.
• Waterproof surface sheds rain and limits standing water.
• Windproof design plus cable and winch prevent blow-off.
• Snow-resistant strength for winter storage or off-season use.

Will it fit my pool and how do I install it?

This 21ft cover is sized to fully protect pools with diameters of 17 to 18ft, offering an extra 3ft overlap to ensure complete coverage. Installation is straightforward: unfold the cover over the pool, align the edges, and tighten the supplied cable and winch around the frame for a snug, secure fit.

• Designed for 17–18ft above-ground pools with 3ft overlap.
• Simple lay-down placement—no specialist tools required.
• Includes cable and winch for secure edge tensioning.
• Quick to remove and refit when you’re ready to swim.

How does this cover reduce pool maintenance?

By blocking leaves, insects, dust and UV light, the cover keeps water clearer and lowers the frequency of vacuuming, skimming, and chemical adjustments. It creates a barrier that slows contamination and light-driven algae growth, so routine cleaning and chemical costs can decline.

• Prevents most debris from entering the pool water.
• Blocks sunlight that can accelerate algae formation.
• Limits evaporation and conserves chemicals and heat.
• Helps maintain cleaner water during storage or off-season.

Can this cover be used for things other than pools?

Yes—the durable, weather-resistant fabric and secure fastenings make this cover useful beyond pools. It can protect outdoor equipment, playgrounds, sand pits or temporarily cover camping gear and inflatable structures from dust and UV exposure.

• Useful as a tarp for outdoor furniture or play areas.
• Works well for protecting seasonal equipment from sun and rain.
• Rugged enough for campsite or backyard activity coverage.
• Multi-purpose design extends value beyond pool use.

Who is this for? Homeowners with 17–18ft above-ground pools who want a straightforward, heavy-duty solution to protect water quality and reduce maintenance will benefit most. It's also a practical choice for anyone who needs a versatile, weatherproof cover for outdoor gear, seasonal storage, or backyard play areas. If you need a durable, easy-to-fit cover that stands up to sun, wind and changing weather, the COVALL 21ft round cover is built for that role.