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PAUL station
manual
3 Before the assembly
3.1 Considerations on the raw water source
In general, it is recommended to use the best available water source.
desalinate or detox salty or toxic waters, as is also mentioned on the device.
Thus, which water can be used?
Usually, stored rainwater, e.g. in cisterns or reservoirs is the best raw water source, as
there is little or no contamination from industry, farming or geogenic origin.
Also, rivers can be a good source, provided there is no influence of industry or farming
upstream
If – usually due to lack of water in sufficient quantity – wells have to be drilkled, this wa-
ter may also be of very good quality. However, it is a minimum requirement to check
concerning heavy metals, arsenic and fluoride, at least as a grab sample. Also the con-
centration on iron and manganese should be analyzed.
Advice can be given upon request.
3.2 Water supply for the Raw Water Tank
It has to be considered how the RWT can be fed with raw water. This will usually be done by
an electric pump. Energy might be supplied by local grid or by solar power. Of course, the
pump must fit to the type of energy supply.
Whatever solution is appropriate and feasible under the local circumstances, it should be as-
sured that filling the RWT can operate fully unattended without overfilling the RWT.
In case of electric pumps, a float switch that breaks the electric circuit for the pump when ex-
ceeding a set water level in the RWT can also be provided, the so called OPS, see chapter 2.
When selecting the pump, important criteria include
Suction or submerged pump
Energy requirement, depending upon length and diameter of hoses and height to be
sucked/pumped
Ability of permanent operation
Ability of running dry – if not, a Run-dry Protection Switch (RPS) is necessary, see
chapter 2
PAUL Station Manual 2019-05-25
page 5
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PAUL
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25.05.2019
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