Manual Velda AQUA TEST (page 35 of 40) (English, German, Dutch, French)

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USER INSTRUCTIONS PROFESSIONAL AQUA TEST

GENERAL

With the help of the Velda NO2 Test the nitrite content of fresh and salt water can be determined

quickly and quite accurately. Both for garden ponds and for aquaria it is important to have an

insight into the nitrite content of the water. Although nitrite is almost always present in water, it will

not be detectable in duly flourishing garden ponds and aquaria. In a biologically functioning water

environment it will at once be decomposed into nitrate by nitrifying bacteria. This last phase in the

process (nitrate) will be absorbed by plants and / or algae. A too high nitrite content may occur

when the bacterial decomposition process is upset. In that case there is an insufficient number of

nitrifying bacteria to take care that the dangerous nitrite will be decomposed into the harmless

nitrate. Especially in newly sunk ponds and aquaria interferences in the nitrification process may

easily occur, as a result of which a too high nitrite content will form (over 0.2 mg/l).

In certain cases nitrite accumulation can be the result of a too high

nitrate level. The decrease in nitrate stagnates owing to the presence

of growing plants and / or algae. Owing to this, nitrite can no longer be

converted into nitrate, which results in a too high nitrite content (over

0.2 mg/l). In this case it is necessary to refresh the water and add more

growing plants.

If nitrite is found it is advisable to apply Bacterial. Bacterial is a product

of Velda which contains billions of nitrifying bacteria. These bacteria

make sure that the nitrite content will be quickly reduced below 0.2 mg/l.

If a nitrite content from 1 mg/l is found, part of the water should be re-

freshed immediately. Consequently Bacterial can be added.

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 NO2 test liquid no. 1, followed by 5 drops of NO2 no. 2.

Now close the graduated beaker with the cap and shake well. Take the cap off the graduated bea-

ker. 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 com-

parator. Now turn the colour chart until both beakers are showing the same colour when looking

from above. The similar colour indicates the nitrite content in mg/l. After use rinse the graduated

beakers well.

The speed at which any discolouration will develop, depends on temperature. Wait for at least 5

minutes with the judgement of water having a temperature below 20 °C. This test practically has

an unlimited shelf life, provided that it is kept cool and dark. Keep away form children.

NO2GB

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Velda AQUA TEST Manual

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