Pool Mate 20x40 Ft Blue/Silver Deluxe Solar Cover for Inground Pools, 8-Mil

Yes, for the right buyer. The Pool Mate 20x40 Ft Blue/Silver Deluxe Solar Cover for Inground Pools, 8-Mil ranks #10 in our Best Inground Pool Covers list. Its biggest strength: one of the few stock sizes built specifically for larger 20x40 inground rectangles rather than requiring a custom cut. The main caveat: smallest review base (260) of the solar covers in this roundup, less feedback on long-term large-format durability.

The main trade-offs owners and reviewers point to: smallest review base (260) of the solar covers in this roundup, less feedback on long-term large-format durability; 8-mil thickness on a large surface area wears and punctures faster than a 12-mil cover would at this size; handling a cover this large is still a two-person task despite the lighter 8-mil material.

8-mil blue/silver polyethylene bubble construction, 20x40 ft rectangle sizing for inground pools, Raises water temperature up to 10-15 degrees F in full sun, Reduces evaporation by up to 95% and Reflective silver underside.

Worth comparing: Robelle 20x40 Ft Ultimate Charcoal Winter Pool Cover, 20-Year, Blue Wave NS450 24x40 Ft Rectangle Solar Blanket for In-Ground Pools, 12-Mil Blue and Blue Wave NS492 12x24 Ft Oval Solar Blanket for In-Ground Pools, 12-Mil Clear. Each ranks near it in our research for a slightly different buyer.

It's sold on Amazon. Prices and stock change often, so check the current listing before you buy, our link takes you straight to it.

Above-ground pool covers hook to the top rail of the pool wall using an elastic cable or winch-and-cable system, so the cover only needs to match the pool diameter plus a few inches of overlap. Inground pool covers anchor to the surrounding deck, which sits at ground level, so the cover has to extend well past the water's edge onto the coping and deck itself. Standard inground winter covers add a 4 to 5-foot overlap on every side (a 20x40 pool needs roughly a 25x45 cover), and safety covers are measured to the exact deck anchor points, which is why safety covers are far more often custom-fit than stock-sized. Buying an above-ground-style cover for an inground pool will leave gaps at the edges regardless of how it is anchored.

That depends entirely on who has access to the pool. If small children, pets, or anyone unable to swim can reach the pool area unsupervised, a winter tarp is not adequate protection, it is not weight-rated and can fail catastrophically under a person's weight, especially once pooled rainwater or snowmelt sits on top of it. Local and state codes in many areas require a compliant barrier (fence, cover, or both) around residential pools; an ASTM F1346-rated safety cover satisfies the cover portion of that requirement in jurisdictions that allow it. If the pool area is already fully fenced with a self-latching gate and unsupervised access isn't a realistic risk, a winter tarp is a reasonable and much cheaper choice for keeping debris and sun out during the off season.