Maytronics Dolphin™ H Series 99996373-H50 Blue Commercial In-Ground Automatic Pool Cleaner. The Dolphin™ H-50 is part of the H-Series of Industrial Grade Cleaners that are easy-to-use and designed for all pool types, sizes and shapes. This model features a 3 hour cleaning cycle and a "Standard" cleaning mode that uses two brushes to clean the floor, walls, and waterline of your pool.