Pressure-side vacuums are a type of pool cleaning system that operate by using water pressure to collect debris. They connect to the pool's return line, which pushes water into the vacuum. This creates suction that pulls dirt, leaves, and other particles into a filter bag or canister for easy disposal. These vacuums are effective for cleaning the pool floor and walls, making them a popular choice among pool owners. Unlike suction-side vacuums, which rely on the pool's filtration system, pressure-side vacuums can work independently, often providing a more thorough clean with less strain on the pool's pump.