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When water is not completely opaque, the semi trash is not needed. They are more expensive and don't pump as much water, as the clearances are a little greater. Mine is rated to handle very small solids.

When I pump, I usually pump all day, and need the highest efficiency possible. Sometimes, in the summer, after a good rain, there is only sufficient clear flow in the creek for one or two days of pumping. The creek is usually too muddy the first day, and I would not want all that mud in the pond, so the trash pump would not be useful anyway.