Rectangular airlifts can be compact and more space efficient than airlifts made with multiple cylinders. They can generate much higher water volume outputs than single-cylinder airlifts. However, rectangular airlifts that use injection grids with fine-pore diffusers or perforated cylinders can have air flow and injector spacing constraints. A prototype high-volume rectangular airlift design features a bilateral configuration of air portals that provides symmetrical airstream distribution and more precise injection depths with less fouling.
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