How a permeate pump works with a reverse osmosis system

Why should you add a permeate pump to your reverse osmosis system?


  • Get greater production from your reverse osmosis membrane.
  • 85% Reduction of Water Waste
  • Faster RO Tank
  • Fill Time



Higher Water Quality

A typical reverse osmosis system utilizes an automatic shut-off valve (ASO) that stops the RO system from producing water when the holding tank reaches 50%-67% of the incoming water pressure. As the holding tank gets close to being full, the quality of the water produced by the system begins to diminish, as well as sending more water down the drain due to the increasing back pressure from the holding tank. 


When a permeate pump is installed, the RO membrane is isolated from this back pressure and allows the RO membrane to operate with up to 85% of the incoming water pressure, even when the holding tank is nearly full. This dramatically improves the efficiency of the membrane and overall quality of your water, as well as increasing the pressure and related volume of stored water in the holding tank.

  • Energy Efficient: No electricity required for operation 
  • Faster Fill Time: Fills product tank up to 4 times more rapidly
  • 85% Reduction Rate: Saves up to 85% of pre-filter and booster pump life

Even More Great Benefits

  • 2 year manufacturer's warranty on the Aquatec ERP-1000 Permeate Pump
  • Aquatec ERP-1000 Permeate Pump is NSF approved to Standard 58
  • Enhances contaminant rejection resulting in better water
  • Permeate pump will increase membrane life and lower "TDS creep"


Increases RO System Productivity

Residential RO Membranes

Commercial RO Membranes

As a general rule, each person in a household uses about 2 gallons per day. In order to keep up with demand, reverse osmosis drinking water systems have been equipped with 35 or 50 gpd membranes with up to five stages of filtration. In actuality, a 36 gpd produces only 15 gallons per day. With a permeate pump, production of the same 36 gpd membrane can more than double, reaching as much as 36 gallons per day!

5 Stage RO System 

without Permeate Pump

36 GPD Membrane

Actual Production: 15 Gallons Per Day*

5 Stage RO System

4 Stage RO System 

with Permeate Pump

36 GPD Membrane

Actual Production: 35 Gallons Per Day*

*Actual production rates are approximations of what these systems can produce

4 Stage RO System

Integrates with Most Residential RO Systems Easily

How Does A Reverse Osmosis Permeate Pump Work?

Permeate Pumps

 for an RO system are simple, yet revolutionary devices that use the energy of the water going to the drain as leverage to push the purified water into the holding tank. "Permeate" is a technical term for the purified water that is produced through the reverse osmosis membrane. The water that is sent down the drain after rinsing the membrane is called the "brine." This device does not require electricity because the pump uses hydraulic energy that normally goes to the drain unused. By using a permeate pump, the pump will isolate the tank from the membrane and let the membrane perform as though it were in an atmospheric tank system. 


Informational Video


Informational Diagram

 Permeate pump in a reverse osmosis system


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