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Types of stain
Possible cause
Pink stains
These are generally found on seal parts and caused
by bacteria that grow on components of these plastic
parts and may be related to the water preparation.
If PHMB is used for disinfection in the presence of
copper, there is a risk of pink stains forming.
Yellow stains
These are generally found on seal parts and caused
by bacteria that grow on components of these plastic
parts and may be related to the water preparation.
If PHMB is used for disinfection in the presence of
copper, there is a risk of pink stains forming.
Presence of pollen or red algae, agricultural work,
greasy products (suntan lotion or cosmetics), organic
remnants (decomposition of plants) or dirt
some calcium compounds, which are used in
chemical products (pebble-shaped), tablets
When the water in the mini-pool is prepared with
bromine, it can cause stains (from yellow to brown)
due to the combination of a higher dosage than the
manufacturer recommendation and a pH level lower
than 6.9.
Shock disinfection with an oxidising agent can lead to
the formation of gas that burns the mini-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 mini-pool, no earthing is
a
needed - see DIN VDE 0100-702.]
b
WARNING: Calcium sequestering agents often contain phosphorus or phosphorous bonding agents that can cause or increase the growth of algae
and/or can affect measurements (of free chlorine, redox potential) with on-line devices. For this reason, when measuring with on-line systems, preference
should be given to ion exchangers and/or metal filters in the water line (before water runs into the pool).
Possible solution
In most cases these stains are irreversible.
It is important to react as soon as the stains appear. The swimming
pool manufacturer is to be informed and they will furnish information
about how to proceed, depending on the kind of stain.
GB/IE/NI
15
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