It's about that time of year. National Pool Opening Day is tomorrow, April 25, and summer is almost here, which means pool owners everywhere are getting ready to unveil the horrors of whatever happened during the off-season. Most of the Beatbot lineup is on sale at Amazon and Beatbot's own storefront, with prices starting at $499. Beatbot makes many of the best pool-cleaning robots we've tested, and we've highlighted our top picks below. Note that the discounts are scheduled to end on April 26, though items may sell out sooner. Happy pool party season! (Drop me an invite!) Beatbot AquaSense 2 Ultra for $2,649 ($500 Off) Our favorite robotic pool cleaner overall, the AquaSense 2 Ultra has what WIRED contributor Chris Null called “near-perfect cleaning capabilities.” It has six hours of battery life and AI-powered debris detection, and it can handle cleaning the floors, walls, and waterline. You'll get a charging stand as well.…