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Function

AQA Perla is a duplex water softening unit that func-
tions in accordance with the ion exchange princi-
ple. The unit is run with columns that continually
change at short intervals. This method of operating
ensures that softened water is even available dur-
ing a regeneration procedure, while the frequent
column change minimises stagnation times. In terms
of chemical and microbiological parameters, this
leads to significantly better water quality than with
conventional alternating softening units.
Regeneration is triggered volumetrically (depends
on the quantity of water).

Very brief salt dilution times and short regeneration
periods are achieved thanks to the special salt hop-
per for storing and dissolving salt.

The hardness of the drinking water on site and the
desired hardness of blended water are entered into
the electronic system when the unit is started up.
All other unit parameters are stored in the electronic
system. All unit data is preset and unit parameters
can be queried. The remaining capacity is displayed
in litres and in bar-graph form. The flow quantity is
displayed in l/h during operation.

The unit is equipped with a device that disinfects
the ion exchanger resin during the regeneration
process. Spring-loaded non-return valves protect all
water connections on the inlet side of the unit (in
compliance with DVGW [GermanTechnical and Sci-
entific Association for Gas and Water]). This elimi-
nates the need for a system or pipe isolator.

The system complies with all relevant national and
international standards.

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In the event of a power failure for more than 8 hours,
an automatic regeneration of both columns is trig-
gered when the power returns.
The programmed parameters are stored persistently
and remain unaffected by power failures.

Installation conditions

Observe all applicable installation regulations, general
guidelines, general hygiene requirements and techni-
cal specifications.

Softening systems may not be installed in water supply
systems which provide water for fire extinguishing pur-
poses.

The pipe network must be flushed before the unit is in-
stalled.

The hard water to be fed into the unit must always meet
the specifications of the Trinkwasserverordnung [Drink-
ing water ordinance] or EU Council Directive 98/83/EC.
The total dissolved iron and manganese may not ex-
ceed 0.1 mg/l. The hard water to be fed into the unit
must always be free of air bubbles. If necessary, a bleed
device must be installed.

Continuous operation of the softening unit with water
containing chlorine or chlorine dioxide is possible if the
concentration of free chlorine/chlorine dioxide does not
exceed 0.5 mg/l.
However, continuous operation with water containing
chlorine/chlorine dioxide causes the ion exchanger resin
to age prematurely. A softening unit reduces the con-
centration of free chlorine and chlorine dioxide. In other
words, the concentration in the outflow of a softening
unit is generally considerably lower than in the inflow.

The unit should be sized in such a way that regenera-
tion is necessary at least once a day based upon the
throughput. If water consumption is reduced, e.g. during
holidays, a shut-off device must be fully opened for at
least 5 minutes before water can be used again (DIN
1988 part 4 and 8).

Use corrosion-resistant pipe materials for installation. Pay
attention to corrosion-causing chemical properties in the
combination of different pipe materials (mixed installa-
tion), even in the direction of flow upstream of the sof-
tening unit.

A protective filter must be installed in the direction of
flow no further than 1 m

1 m

1 m upstream from the unit. The

filter must be functional before the softening unit is in-
stalled. This is the only way to ensure that dirt and corro-
sive products cannot enter the softener.

You must check whether a mineral dosing device should
be installed downstream from the unit for the purpose of
preventing corrosion.