PoolTux CSPTGS18360 18' x 36' Green Emperor Solid Rectangle Inground Safety Cover No Step. Emperor Safety Covers are the most elegant winter attire for your pool and these safety covers are not just good looking, they are the highest performing safety covers made. The PoolTux Emperor solid safety cover allows rainwater and melted snow to flow through for optimum drainage and safety, but keeps debris out. Emperor covers screen out 100% of the sun's ultra-violet rays, which means you'll spend less time cleaning your pool in the spring. These no less than quality by design pool safety covers. The durable solid swimming pool safety cover is only half the weight of a full-weight solid for added ease during installation and removal. The emperor light weight Solid Safety Cover features the "Invisi-Strip" drain that runs from one end of the cover to the other, which practically eliminates standing water on the cover.