Reverse osmosis, Ro-m, Carbon pre-filter capacity – Unger RO60S User Manual
Page 20: Function of reverse osmosis, Capacity of the carbon pre-filter (ro30c & ro60s)
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F
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™ Ro-M
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Reverse osmosis
Semi-permeable membrane
Concentrated
solution
Pure water
Osmotic
pressure
Osmosis
Reverse osmosis membrane
Reverse osmosis
Concentrated
solution
Pure water
Pressure
CARBON PRE-FILTER CAPACITy
Chlorine content: 0,5 ppm
1 ppm
2 ppm
3 ppm
4 ppm
5 ppm
hours:
800
400
200
133
100
80
days:
160
80
40
27
20
16
months:
8
4
2
1
1
0,8
2.1. Function of reverse osmosis
When separating saline solution from pure water by a semi-permeable membrane, the system tries
to establish concentration compensation.
The water passes through the membrane without the influence of external forces and dilutes the
solution until a balance is established. This process is called osmosis.
In the balance, the static pressure in the solution is the same as the osmotic pressure.
The process is reversible when applying pressure to the saline solution, thus overcoming the osmo-
tic pressure. During this process of reverse osmosis, pure water is transported through the
membrane, while the saline solution is concentrated.
In the technical reverse osmosis process, the concentrated solution is referred to as concentrate,
which is continuously drained from the system and which produces pure water permeate. Thus,
when speaking about performance, permeate output or pure water output are indicated.
2.2. Capacity of the carbon pre-filter (RO30C & RO60S)
•
The capacity of the special carbon pre-filter depends on the chlorine content of the water.
•
At 2ppm of chlorine the filter works for app. 100.000 litres water.
•
Assumption: if you work 6 hours per day and 5 days a week, this capacity would last:
•
app. 200 working hours or app. 40 working days or app. 2 months
You can use ph-test stripes to test the water quality. To check if the pre-filter
works correct, test the water at the concentrate outlet on back of the RO30C/
RO60S. If the value is above 0 ppm, you have to exchange the pre-filter.
The chart on bottom shows the capacity at several ppm values, please check
your local situation: