Permeate pump

Product no.: 12729

“Permeate” is industry jargon for product water: the purified water that has passed through the reverse osmosis membrane, the water you will drink. The water that is rejected by the membrane, the waste water, is called “brine.”


A permeate pump is a special device for undersink reverse osmosis units that uses the hydro power of the brine, or waste water, to pack the permeate, or product water, into the storage tank.


A standard reverse osmosis unit is controlled by an automatic shutoff system that shuts down water production when pressure in the storage tank reaches about 2/3 of the inlet water pressure. In other words, if your city water pressure is 60 pounds (psi), your reverse osmosis unit will stop producing and storing water when pressure in the storage tank reaches about 40 psi. For most household purposes, this is plenty of pressure and the RO unit will run wonderfully.


The same RO unit with a permeate pump and 60 psi coming in will continue to produce water until pressure in the tank reaches almost 60 psi.


This is especially helpful for low-pressure installations. If, for example, you have a well that yields only 40 psi, a standard RO unit will run with your pressure, but it won’t run well. The unit will shut down when tank pressure reaches 25 psi or so. With a permeate pump, the unit will put almost the full 40 psi into the storage tank.


What’s best about the permeate pump, though, is the increased efficiency. With a standard shutoff system, as the storage tank fills, the RO unit must push against an increasing amount of storage tank pressure. With the permeate pump, the unit is shielded from this pressure and the membrane works in a virtually pressure-free situation, even when the tank is almost full.


Pros & Cons


Among the pump’s disadvantages are


A slight intermittent thumping noise—not really loud, but you’ll know when it’s running.

A slight increase in TDS (total dissolved solids) reading under normal household operation. Because the pump starts the unit literally every time you take a thimble-full of water from the unit, total rejection of dissolved solids will not be quite as good as with a standard unit. This is normally not a significant disadvantage, and it is offset by the greatly enhanced pressure performance, especially with low-pressure installations. And, if you take lots of water out of the tank at one time, you’ll actually experience improved TDS performance.

Advantages to the permeate pump are


The greatly improved water pressure from the RO tank, especially in low-pressure installations.

No electricity used, and no electrical connection (as compared with electric booster pumps).

Much greater efficiency. The unit does not have to push against the pressure of storage tank. The ratio of product water to waste water improves significantly.

Although the pump controls the unit completely and does not need a shut-off valve to shut down the unit, some prefer performance with a shutoff valve. The manufacturer, therefore, offers a special 90% shutoff valve designed to use with the permeate pump. It shuts the unit down when tank pressure reaches 90% of the inlet pressure. We do not recommend that you use it without the permeate pump. 30665-3060986

In stock


Price includes VAT, plus delivery

Delivery weight: 0.5 kg
Browse this category: Pumps

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Customer ratings for Permeate pump

Number of ratings: 8
Average rating: 4.8
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from on 20/04/2017
Good product with good
explaining How to mount it. Good service and fast sending
from on 15/03/2016
Sehr sehr gutes Preis/Leistungsverhältniss, einfache Montage, sauberes, geklärtes und gesundes Wasser, belebend, erfrischend und Urgesund, TOP Service, TOP Preis, TOP Qualität, immer gern wieder :-)
NAchrüstung war sehr einfach
from on 27/02/2016
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