Cover a large 36 ft. x 18 ft. inground family pool, club pool, or semi-commercial pool with a 12 mil blue PE solar pool cover that raises water temperature by 8 to 15 C (14 to 27 F) under sun and cuts evaporation by up to 95 percent. The 36 x 18 ft. (10.97 x 5.49 m) spec is built for the larger end of the residential and club pool market, dialed for pools that a stock 28 x 14 ft. cover leaves exposed on both long edges. At 12 mil thickness, the cover runs mid-heavy consumer-grade: a real durability step above 8 mil value covers, delivering better UV and wind-drag life across multiple swim seasons, without the top-tier 15 mil weight and handling bulk that a two-person haul demands. The closed bubble structure floats on the water, sealing against evaporation and locking in the heat that the sun drops during daylight, especially valuable on a large pool where surface area and evaporation loss scale together. The cover also keeps leaves, dust, pollen, and debris off the water during the off-hours, cutting vacuum run-time and chlorine shock use. The trim-to-fit PE body cuts cleanly with scissors for irregular edges, rock-ledge walks, and skimmer cutouts. Use with chlorine under 2.5 ppm and pH above 7.2 for full material life. Net 38.17 lbs. (17.31 kg). Fit for large inground residential, club, HOA community, and small semi-commercial pools.