Anthony, Thank You very much for your wonderful answer. You did manage to let me know exactly what I was wondering about. Again, Thank You. What you have alluded to is that if the multistage feed pump were placed on the discharge side of a membrane, then an energy savings of about 1.5% might be possible. It took me a moment to realize this. And while 1.5% is a small number, on larger RO systems, 1.5% could be a significant cost savings. Myself, I have worked with feed pumps before and do know you are right about their being efficient. And if the work they did on the intake side increased, the discharge pressure would decrease. And the flow rate should be able to be maintained. It should only change how they perform work. Adding; if this is right, then with RO systems powered by petrol, 15 liters of every 1,000 liters might be saved. And a primer pump may be necessary to ensure air is out of the system and the membrane is properly saturated. Still, for long term cost savings, am hoping someone can look into it. Have posted this where I know one university student will see it. Maybe he will let his professor know about this.

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Anthony, Thank You very much for your wonderful answer. You did manage to let me know exactly what I was wondering about. Again, Thank You. What you have alluded to is that if the multistage feed pump were placed on the discharge side of a membrane, then an energy savings of about 1.5% might be possible. It took me a moment to realize this. And while 1.5% is a small number, on larger RO systems, 1.5% could be a significant cost savings. Myself, I have worked with feed pumps before and do know you are right about their being efficient. And if the work they did on the intake side increased, the discharge pressure would decrease. And the flow rate should be able to be maintained. It should only change how they perform work. Adding; if this is right, then with RO systems powered by petrol, 15 liters of every 1,000 liters might be saved. And a primer pump may be necessary to ensure air is out of the system and the membrane is properly saturated. Still, for long term cost savings, am hoping someone can look into it. Have posted this where I know one university student will see it. Maybe he will let his professor know about this.