Crivit QP-17282 Gebrauchsanweisung Seite 11

Types of stain Possible cause
Whitish stains at Suntan lotions and cosmetics that float
the waterline on the surface of the water, combustion of
hydrocarbons from wood or charcoal fire,
car exhausts, aeroplane exhausts, or any
other pollution from the immediate vicinity
or more distant surroundings of the swim-
ming pool.
Green stains Since they are organic in origin, these stains
only occur when living organisms are pres-
ent (algae, fungi, etc.) and may be related to
a significant disturbance in the balance of
the water preparation.
Pink stains These are generally found on seal parts and
caused by bacteria that grow on compo-
nents of these plastic parts and may be
related to the water preparation.
If PHMB is used for disinfection in the pres-
ence of copper, there is a risk of pink stains
forming.
Yellow stains Presence of pollen or red algae, agricultural
work, greasy products (suntan lotion or cos-
metics), organic remnants (decomposition
of plants) or dirt
some calcium compounds, which are used
in chemical products (pebble-shaped),
tablets
When the water in the swimming pool is
prepared with bromine, the combination
of a higher dosage than recommended by
the manufacturer and a pH level lower than
6.9 can cause stains on the top layer (from
yellow to brown).
Shock disinfection with an oxidising agent
can lead to the formation of gas that burns
the swimming pool surface where it is not in
contact with water.
WARNING: Earthing the swimming pool promotes the corrosion of metal parts. When no electrical current reaches the swim-
a
ming pool, no earthing is needed - see DIN VDE 0100-702.
WARNING: Calcium sequestering agents often contain phosphorus or phosphorous bonding agents that can cause or
b
increase the growth of algae and/or can affect measurements (of free chlorine, redox potential) with online devices. For this
reason, when measuring with online systems, preference should be given to ion exchangers and/or metal filters in the water
line (before water runs into the pool).
Possible solution
See operating instructions and tips of the swimming
pool manufacturer, for the filter unit or chemicals.
In most cases these stains are irreversible.
It is important to react as soon as the stains appear. The
manufacturer of the swimming pool is to be informed
who will give instructions on how to proceed depending
on the type of stains.
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