How to go from 5 pumps to 4?

I'm puzzled by the concept of reducing pumps from five to four. Could you please elaborate on the steps involved in achieving this transition? I'm interested in understanding the rationale behind this decision and how it might impact the overall system or process. Is there a specific technique or strategy that should be followed? Additionally, could you highlight any potential challenges or considerations that need to be taken into account during this transition? I'm eager to learn more about this topic and appreciate your insights.