Dolphin M250 - Robotic Pool Cleaner Previously known as the M3, this is an excellent quality automatic pool cleaner at an affordable price. Cleans the floor and coving of pools up to 10m (36ft). An efficient, self-contained filter bag collects the dirt and debris. All Dolphin cleaners supplied by us benefit from UK based factory trained service and support. We can assist you with choosing the right Dolphin cleaner and offer full warranty and non warranty service back-up. Relax – let a Dolphin clean it for you!