Vivosun 6 Outlet - 317GPH, 15W, 20 L/Min or 634GPH, 25W, 40L/min
 
These pumps have reliably supported us throughout our ten years of operation. They are incredibly powerful, capable of supplying up to six (317 GPH) or ten (634 GPH) 1-gallon culture jars. However, this impressive capacity comes with some trade-offs. The pumps themselves are not adjustable on the base unit; instead, they include a six-valve adjuster for regulating individual lines. Additionally, since these units operate continuously, they tend to get quite hot, making them unsuitable for placement inside cabinets or enclosed spaces. Another drawback is the noise level; these pumps are notably loud, with vibrations audible in nearby rooms.