JBL TestLab Handbuch Seite 36

In aquariums and ponds with few plants or with no plants at all, or in marine aquariums, the oxygen level should
always be maintained at the appropriate equilibrium level using technical equipment.
Help for low levels
Aquarium:
Since plants cannot produce oxygen at night, but instead breathe normally, the oxygen content gradually
decreases at night until the next morning the lighting is switched on. However, there is no danger to the fish as
far more oxygen is produced during the day than is used at night. Shortly before the lighting is switched on, the
oxygen content should not normally have dropped below 4 mg/l. If it is below this level, this indicates that there
are either too few plants in the aquarium, the plants are not being correctly looked after or that the aquarium is
over-stocked with fish.
Possible remedies: add more plants; improve the care of the existing plants, e.g. by installing a CO
PROFLORA CO set); in the case of overstocking with fish, gentle aerating at night e.g. with an air pump of the
2
JBL ProSilent range (regulated by a time switch) will help.
In aquariums without plants, the situation can also be improved by increasing water movement at the surface
and/or installing an aerator (JBL Pro Silent range). In marine aquariums, increasing water movement also helps,
using either flow pumps (JBL ProFlow) and (if not already installed) fitting a skimmer.
Garden pond:
Especially in the warm seasons oxygen deficiency in ponds may arise. A strong water movement helps here. Use
strong pumps (pond filters), e.g. in conjunction with a waterfall or a watercourse. Aeration kits for ponds also can
remedy the situation. The adding of oxygenating aquatic plants, such as waterweed and hornwort, increase the
oxygen level in a natural way.
Instructions:
1. Swill out the test jar several times with the water to be tested.
2. Fill the test jar to the brim with the water to be tested by submerging it in the water. Place it on a water-
resistant surface.
3. Add 6 drops O reagent 1 drop by drop and slowly add 6 drops O
2
4. Close the test jar using the enclosed lid, ensuring there are no air bubbles, and shake vigorously for about
30 seconds.
5. Move the test jar backwards and forwards over the white section of the colour scale at distances of approx.
3 – 5 cm. Select the colour which matches most closely.
6. Read off the oxygen content on the colour chart.
Our tip for the environmentally-friendly user: All reagents for JBL test sets are available from your retailer as
reasonably-priced refill packs!
The instructions are repeated in a series of simple diagrams on the reverse of the colour chart.
Warning and safety notices
O reagent 2:
2
Danger
H314 Causes severe skin burns and eye damage.
P101 If medical advice is needed, have product container or label at hand. P102 Keep
out of reach of children. P103 Read label before use. P280 Wear protective gloves/
protective clothing/eye protection/face protection. P305+P351+P338 IF IN EYES: Rinse
cautiously with water for several minutes. Remove contact lenses, if present and easy
to do. Continue rinsing. P310 Immediately call a POISON CENTER or doctor/physician.
Hazard-determining component of labelling: sodium hydroxide.
Ammonium / Ammonia Test Set (NH
Special features:
The JBL ammonium test set is for the measurement and routine control of the ammonium/ammonia content in
freshwater and saltwater as well as in garden ponds (koi ponds) within a range of 0.1 to 5.0 mg/l (ppm). Using
the compensation method specially developed by JBL, precise and reliable results can be obtained even in
moderately discoloured water, e.g. as a result of peat filters and disease treatment.
reagent 2. The test jar will overflow.
2
/ NH
+
4 3
34
supply (JBL
2
)
UK