{"product_id":"21-ft-pool-cover-with-automatic-drain-quick-install-uv-protected","title":"21 Ft Pool Cover with Automatic Drain - Quick Install, UV Protected","description":"\u003cp\u003eIn this review of the 21 ft pool cover, the bottom line is simple: it is a practical, heavy-duty cover for owners of 21 ft frame-round above ground pools who want quick installation and reliable drainage. The cover is best for homeowners who need a simple seasonal or storm-ready solution that resists tearing and helps keep water clean. The single biggest reason to buy is the included \u003cstrong\u003eautomatic drainage device\u003c\/strong\u003e, which prevents dangerous water pooling after rain and simplifies maintenance compared with basic covers.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize guidance:\u003c\/strong\u003e Designed specifically for a 21 ft frame-round pool and intended to fit pools with the correct measured diameter to ensure good fit and tension.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic drainage:\u003c\/strong\u003e An included drainage device self-drains accumulated water and uses a blocking tube to reduce clogging and control the water level on the cover.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick installation:\u003c\/strong\u003e One-piece design with an innovative ratchet tensioner allows fast installation and removal without extra fittings, saving time and effort.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable fabric:\u003c\/strong\u003e Made from 420D woven polyester that resists tearing and does not produce harmful substances under sunlight, helping keep pool water sanitary.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolar heat retention:\u003c\/strong\u003e The black 420D fabric absorbs heat to help keep water warmer, providing a passive solar effect while blocking debris.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReinforced construction:\u003c\/strong\u003e Double-thread sewing and waterproof tape at seams protect against leaks and extend cover life in bad weather.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe cover is ideal for owners of a 21 ft steel wall or frame-round above ground pool who want an easy-to-fit solution that stays secure in wind and sheds rainwater without constant babysitting. It works well for families or seasonal pool users who value durability, simple upkeep, and the added benefit of passive heat retention.\u003c\/p\u003e\u003cp\u003eThose who should look elsewhere include owners of nonstandard or significantly larger pools-measure the actual pool diameter carefully, and if it exceeds 254 in consider a larger size. Also, buyers who need clear or reflective covers for specific sunlight needs may prefer a different fabric finish.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIncludes an \u003cstrong\u003eautomatic drainage device\u003c\/strong\u003e that reduces dangerous water pooling after storms.\u003c\/li\u003e\n\u003cli\u003eQuick one-piece installation with ratchet tensioner makes removal and reattachment easy for one person.\u003c\/li\u003e\n\u003cli\u003e420D polyester fabric and double-thread sewing provide strong tear resistance and long-term durability.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFit depends on exact pool diameter; if the pool measures larger than recommended, buyers must size up for proper drainage and tightening.\u003c\/li\u003e\n\u003cli\u003eSome users report mixed experiences with final water retention behavior depending on setup and weather.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eDesigned pool size\u003c\/td\u003e\n\u003ctd\u003e21 ft frame-round pool\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFabric\u003c\/td\u003e\n\u003ctd\u003e420D woven polyester (black)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrainage\u003c\/td\u003e\n\u003ctd\u003eAutomatic drainage device with blocking tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eDouble thread sewing and waterproof tape at seams\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eOne-piece quick install with ratchet tensioner\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat retention\u003c\/td\u003e\n\u003ctd\u003eBlack fabric absorbs sun for solar warming effect\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe 21 ft pool cover is a solid choice for owners of correctly sized frame-round above ground pools who want easy installation, effective debris protection and a convenient \u003cstrong\u003eautomatic drainage\u003c\/strong\u003e system. Its durable 420D fabric and reinforced seams make it good value for those needing a season-ready cover, but buyers must measure their pool carefully to ensure the cover performs as intended.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWill this cover fit my 21 ft pool?\u003c\/strong\u003e\u003cbr\u003eMeasure the actual pool diameter; the cover is designed for 21 ft frame-round pools but if your pool measures over 254 in you should choose a larger size.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does the drainage device work?\u003c\/strong\u003e\u003cbr\u003eThe included automatic drainage device lets accumulated water flow off the cover while a blocking tube helps prevent clogging and controls the water level.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the fabric safe in sunlight?\u003c\/strong\u003e\u003cbr\u003eYes, the 420D woven polyester is rated for color fastness and is made from materials that do not release harmful substances under sunlight exposure.\u003c\/p\u003e","brand":"SIHAIAN","offers":[{"title":"Default Title","offer_id":48612074029275,"sku":"B0DX24S94F","price":94.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/41V1sO2xm1L._AC_cbee48d4-aa12-4c46-ad73-b29dac8ca655.jpg?v=1778407569","url":"https:\/\/gearmusthave.com\/products\/21-ft-pool-cover-with-automatic-drain-quick-install-uv-protected","provider":"GearMustHave","version":"1.0","type":"link"}