A sump pump is designed to remove water, such as ground water or surface water. Sump pumps can ONLY move water and will not effectively move any solids. An effluent pump is able to move a combination of liquid and some solids. Effluent (by definition) is the outflow from a sewage treatment plant, which includes both liquids and some solids. Effluent pumps are typically used to pump waste from toilets while sump pumps are typically used to remove water that has collected in a particular location.
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