The ERP 1000 gets the following
Benefits to your System:
- Faster production against tank pressure
In an RO- systems that uses the ERP- 1000 Permeate
pump the RO- membrane always sees the full pressure across the membrane
even if the tank is almost up to the same pressure. This way the system
does not loose its performance.
In a normal system you would for example have 60 PSI of line pressure. If
the tank sees 30 PSI you only would have 30 PSI left for your membrane. In
reality, this gives you less than 50% of your normal performance. In a permeate
pump system you would still have 60 PSI across your membrane even on 50
PSI tank pressure.
- No loss of recovery during the filling cycle
Systems Using the Aquatec Permeate pump
Technology Donít Show Negative Changes In the System Recovery Rate.
The following graphic is the result of tests on an RO- Unit, that allowed
to disable the built in Permeate pump using a ball valve. The unit was
adjusted to a 4:1 concentrate to product ratio on an empty tank and an
open faucet. Feed pressure was 6 bars.
The red curve shows the changes in recovery on rising tank pressure. To
minimize the problem shut off devices are used that allow producing about
55-75% of line pressure in the storage tank. Note, that in practice the
whole storage tank is not used very often. Normally you work out of the
top portion of the tank.
The blue curve shows the recovery using the Permeate pump. Here you can
see, that the recovery rate does not go down until the Permeate pump shuts
the system down close to 100% of line pressure in the tank. This advantage
can be used in systems that guarantee that there is always a bigger amount
( > 1 Liter per use) of water used. In household applications a shut
off device must be installed. This prevents the production of small
amounts each time you draw a cup of water, which would cause TDS- Creep.
The colored areas show the possible parameters you will see on different
systems. You can easily recognize that even on the early shutdown at 60% of
line pressure, the concentrate to permeate ratio is 12:1 at the end.
- Better quality water out of your System
As RO- Water quality improves, the higher
your differential pressure on the membrane is, a system with a permeate
pump always makes better water. Let us say that your membrane reduces 98%
of the TDS in your water if you got 60 PSI across your membrane. On 30 PSI
differential it will only do about 95%. In the permeate pump system, you
always see full line pressure across your element, which gives you always
the maximum quality water out of you system.
- Saves up to 85% of the Water that normally goes
The following graphic is the result of
tests on an RO- Unit, that allowed to disable the built in Permeate pump using
a ball valve. The unit was adjusted to a 30% recovery. Feed pressure was 6
bars. On 4.5 bars of tank pressure, the unit was shut down. With a
disabled Permeate pump, the last water was produced on a differential
pressure of only 1.5 bars across the RO- membrane. See the results of the
- Saves up to 85% of your prefilter- and booster
As you are saving up to 85% of the water
that is going to drain, your system does not see all that water. This way,
the permeate pump will also improve the life of your prefilters and
- Allows up to line pressure in your tank
Till now, we saw, that a normal system
looses performance, recovery and rejection, the closer we get the tank to
line pressure. Because of that, most systems are limited to about 60- 70%
of line pressure in your tank. With the permeate pump, you donít need
that. You can even get 95% line pressure into your tank without loosing
your design parameters. This of course gives you a far better Flow out of
your faucet or to your equipment.
- Allows you to use smaller system components
Water needs per person in the household
are around 2 gallons per day. To have a fast recovery on your tank,
nowadays systems have 35 GPD Membranes and up to five stages of
filtration. To produce about 8 gallons of water per day, such system sends
far more than 80 gallons of water down the drain. Actually on the top
portion of your tank a 35 GPD membrane makes only around 15 GPD. Now with
the permeate pump, you could go to a 15 GPD Membrane and still have the
same amount of water that you used to get from your unit.
If you used to sell 100 GPD systems for a light commercial system, you
could now use a 50 GPD system with a permeate pump.
- Gets household technology to be used in
commercial applications that were normally requiring industrial systems
The problem with using standard systems
for commercial applications is the fact that you have high minimum
pressure requirements for equipment such as coffee makers, ice makers
To have all stored water above this minimum pressure, you need to increase
your precharge on the tank. This increases the backpressure on your
membrane right from startup. As the normal unit can only put 60- 70% of
line pressure into the tank, you are only able to use a small section of
the performance curve of your system.
For example a system that starts at 30 PSI precharge on 80 PSI feed it
would shut down at 56 PSI tank pressure. On our diagram you would see that
you basically start at 37.5% filling and only use the system to fill the
tank up to 70%. The system performance would be between 30- 65% of your
rated membrane performance.
With the permeate pump, you run the same unit up to 100% of line pressure
and you only see a slight performance drop of 15% at the very end.
the permeate pump work?
The ERP 1000 Permeate pump is using the
energy of the brine Water of your RO- system, to pump the permeate into your
pressure Tank. It does not require electricity for that. It is just using
hydraulic energy that normally goes to drain unused.
This way, it isolates your Tank from the
membrane and lets your membrane perform like in an atmospheric tank system.
How do you install the permeate
The permeate pump can be installed into almost
every existing undercounter RO- system. The main thing is, that you install it
horizontal with both outlet ports in the highest position so that any air
purges out automatically.