Impeller blades on powerheads can wear down over time, decreasing the flow of the pump. For most pumps, this issue isn’t much of a problem. But for return pumps, or pumps that frequently get sand and other material tapped in them, this can be a serious issue. Additionally, some impellers can wear out more quickly than others. It is best to break down all of your pumps once a month to clean and inspect them. Replace worn parts as needed to get the most out of your equipment.