In an RO- systems that
uses the PP- 100 Permeatepump 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 4 bars of line pressure. If the tank sees 2 bars you only would have 2 bars left for your membrane. In reality, this gives you less than 50% of your normal performance. In a permeatepump system you would still have 4 bars across your membrane even on 3,6 bars tank pressure.