What's A Semi-Trash Pump?

Came across a semi-trash pump in a tool catalog. Went online to learn about it and there are loads of pages selling them, but nothing to describe what it does. To confuse things further, they were also selling trash pumps! Huh? Semi-trash pumps .... trash pumps? What do they do? Thanks
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Dumb and Ditzy wrote:

Third listing when Googling for "semi trash" pump: http://flow-control.globalspec.com/LearnMore/Flow_Control_Flow_Transfer/Pumps/Trash_Pumps
Trash pumps are designed to pump large amounts of water that contains hard and soft solids such as mud, leaves, twigs, sand, and sludge. Most devices are portable, heavy-duty centrifugal pumps that feature deeper impeller vanes and larger discharge openings than other pumps. Trash pumps, which are capable of processing materials with suspended particulates that would clog other centrifugal pumps, can move hundreds or even thousands of gallons per minute.
Semi-trash pumps, a type of trash pump with a smaller opening, are not designed to handle large solids or high concentrations of solids. Consequently, regular trash pumps are better suited for applications that require the rigorous pumping of solid-laden water or slurries. Because some manufacturers do not separate trash pumps from semi-trash pumps, so a careful analysis of product capabilities is important when selecting devices.
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