My Clever Pool Pump Inverter operates in low, medium or high mode, the pump has an unpleasant noise, it is normal when in backwash mode?

When the Clever Pool Pump Inverter operates in low, medium, or high mode, it's not uncommon for some pumps to produce a different noise compared to their standard operating sound. Slowing down the pump can sometimes cause it to emit a humming or buzzing noise. This sound is characteristic of certain pumps when their speed is reduced, and while it may seem concerning, it is a normal aspect of their operation. It won't lead to any damage or issues with the pump's performance.