Descaling - Dometic RO 400 User Instructions

MAINTENANCE

Descaling

In time, the substances which the appliance removes from your
drinking water tend to clog the membrane and will eventually
reduce the flow of pure water from the tap. To prolong the ser-
vice life of the membrane, it has to be descaled periodically.
When you notice that the flow rate from the tap has decreased,
you need to follow the descaling procedure below. The time
schedule for how often you will need to do this will depend on
your particular water supply, especially on its levels of calcium
("hardness", see table, right), iron, manganese and possibly sili-
con, as well as of microorganisms.
Even with regular descaling, the maximum flow of purified
water from the appliance will decrease gradually on account of
the normal properties of the membrane. When you notice
that,despite descaling, the flow is about half of what it was when
the membrane was new, it is time to replace the membrane.
Descaling the appliance takes about ten hours, during which
time you will not be able to use the appliance.
You should descale your water purifier:
• when the flow of water from the tap has decreased
• at the intervals recommended in the table (right)
The correct descaling product for this appliance can be ordered
from your dealer (see "Optional accessories and consumables").
The descaling product must be kept out of the reach
of children.
Wash your hands after using it.
1 Disconnect the electrical plug, then plug it back in
again to make the appliance switch to flushing mode.
2 Make sure that the tap for purified water is turned off
and that the appliance has finished flushing. Leave the
electrical supply to the appliance on.
3 Undo filter container II as described under
"Replacing the filters", steps 3–7.
4 Measure 250 ml (corresponds to 200 grams) of the
descaling agent into the container. Fill the container
almost to the top with lukewarm water (20 – 40 °C).
Stir until the powder has dissolved, see Fig. A.
5 Screw the container into place with the aid of the fil-
ter spanner.
6 Turn on the tap for purified water and let the water
purifier operate for 45 seconds.
12
FREQUENCY OF DESCALING
Hardness
Calcium Ca 2+ &
magnesium Mg 2+
mg/l
- 50
50 - 100
100 - 140
A
Frequency of
descaling
°d
every 6 months
- 7
every 3 months
- 14
every month
- 20