The Marisys 240 pump works 24/7 and impeller wear is inevitable. Keep your Marisys pump up to scratch by replacing the impeller yearly, following a good clean of inlet and outlet pipes with an Aqua One Double Ended Pipe Brush
Working under pressure, the AquaReef 200 Protein Skimmer's pump will inevitably sustain wear and tear. Restore the new performance of your skimmer by renewing the pump impeller at least annually.