What is a nanobubble, and how is it different from an aeration-sized bubble?

Nanobubbles are ultrafine gas bubbles less than 200 nanometers in size — about 2,500 times smaller than a grain of salt and invisible to the naked eye. Unlike conventional aeration bubbles, which rise quickly to the surface and pop, nanobubbles are neutrally buoyant, carry a strong negative charge, and remain suspended in the water column for weeks to months. They help disperse dissolved oxygen throughout the water column and into the lake bottom (sediment-water interface), delivering oxygen where it’s needed to manage nutrients and muck.