2001/2 / 2001/4 Wasserdestillierapparate – Water Stills
Seite 15 Rev.04 vom / dated 01.04.2020
9.1 Descaling
Dependent on the hardness of the tap water, the Water Still
must be cleaned from scale formations in regular intervals.
To do so, close the on-site water supply valve and lift the
condenser from the boiler.
A suitable descaling agent is a mixture of 10% formic acid,
10% acetic acid and 80% distilled water. Fill the solvent into
the boiler until it covers the topmost scale deposits and heat
up to maximum approx. 70°C. Make absolutely certain not
to bring the mixture to a boil.
Pour the scale-solvent mix from the boiler after approx. 30 minutes and then rinse the
boiler thoroughly with tap water. Commercial descaling agents, suitable for use with
stainless steel, can also be used according to the manufacturer's instructions (e.g. rea-calc®
of M/s CHEMOTEC GmbH, 63486 Bruchköbel, Germany).
Never use any products containing hydrochloric acid!
These will lead to damages to heating element, boiler,
temperature sensor and the ducts of the screw connections.
Restart the unit as described in chapter 7.
After descalings, the first few litres of distillate should not be used as it might contain traces
of evaporated descaling agent.
9.2 Cleaning
Depending on the degree of impurities in the feed water and the growing contamination of
the water in the boiler, caused by the distilling process itself, the boiling process will cause
foam formation. To prevent these impurities from migrating into the pure water area of the
condenser, the water in the boiler must be exchanged at least twice a week. To do so, close
the on-site water inlet valve and lift the condenser from the boiler. Then empty the contents
from the boiler and rinse thoroughly with tap water.
Restart the unit as described in chapter 7.
The "Cleaning" procedure serves to exchange contaminated water in the boiler
against clean water.
9.3 Re-Initiation after Low Water
In case of low water, the Water Still's temperature limiter will
switch off the unit. In order to restart, allow the unit to cool
down and, as described in chapter 7, fill water into the
boiler until the heating element is below water level.
The triggered low water cut-off must be released. To do
so, loosen the black cap nut at the right-hand bottom of the
Water Still. Inside the thread a small white plastic pin can be
seen that has to be gently pressed inside (e.g. with a pen)
until a clicking sound can be heard.
DOMINIQUE DUTSCHER SAS
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