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Velda AQUA TEST Manual

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USER INSTRUCTIONS PROFESSIONAL AQUA TEST
GENERAL
With the help of the Velda Cu Test the copper content of salt and fresh water can be determined
quickly and quite accurately. Trace elements, to which copper belongs too, are important (micro)
nutrients for nearly all organisms in ponds and aquaria. Fish, plants, but also algae need, besides
many different trace elements and minerals, copper for optimum development. However, the
quantities needed differ strongly per organism and may cause growth disorders at a too low con-
centration, whereas a too high concentration can be fatal.
The tolerance of fish to copper is relatively large. However, the body weight makes a substantial
difference. Spawn is far more sensitive than young or fully grown specimens. In general a copper
concentration up to 3.0 mg/l is no problem. At concentrations from 4.0 mg/l measures should be
taken. At least 50% of the water should be refreshed and the dirt on the bottom should be removed.
In view of the large diversity of water plants a general value can not be indicated, above which growth
stagnation will occur. Experience has taught, however, that most plants do not suffer any damage
from a copper concentration up to 3 mg/l. At higher concentrations it is recommended to pass on to
partial refreshment of water. Algae are far more sensitive to free dissolved copper in water. To fight
beard and fibrous algae copper concentrations ranging from 0.2 to 0.3 mg/l are sufficient.
Also micro-organisms are sensitive to copper. Concentrations of up to 1.0 mg/l are sufficient already
to kill bacteria floating freely in water. However, as micro-organisms are found especially on and in
the bottom, any damage with respect to bacterial equilibrium will remain restricted even at concen-
trations up to 3.0 mg/l.
INSTRUCTIONS FOR USE
Rinse the graduated beakers well and fill them with 5 ml of water to be tested. To one graduated
beaker add while shaking slightly 5 drops of Cu test liquid no. 1, followed by 5 drops of Cu test
liquid no. 2. Now close the graduated beaker with the cap and shake well. Take the cap off the
graduated beaker. Shift the colour chart in the comparator and place the graduated beakers in the
holes that are destined for them. Place the beaker containing the test liquid in the innermost
opening of the comparator. Now turn the colour chart until both beakers are showing the same
colour when looking from above. The similar colour indicates the copper content in mg/l. After use
rinse the graduated beakers well.
This Velda Cu Test measures the dissolved free copper content in the water from 0 to 5.0 mg/l.
Any copper contained in the bottom substrate is not included in the test result. This test practically
has an unlimited shelf life, provided that it is kept cool and dark. Keep away form children.
CuGB
G
… 34 …


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