JBL TestLab Handbuch Seite 47

Note:
If you decide to use the JBL ammonium test set at the same time, make sure not to mix up the measuring
vessels of both sets. Traces of the ammonium test left inside the measuring vessel may lead to incorrect high
readings in the iron test.
The instructions are repeated in a series of simple diagrams on the reverse of the colour chart.
Our tip for the environmentally-friendly users:
All reagents for JBL test sets are available from your retailer as reasonably-priced refill packs!
Warning and safety notices
Attention
H302 Harmful if swallowed. H315 Causes skin irritation. H319 Causes serious eye
irritation. H335 May cause respiratory irritation.
P101 If medical advice is needed, have product container or label at hand. P102 Keep out
of reach of children. P261 Avoid breathing vapours/spray. 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. P405 Store locked up.
K Potassium Test Set
Special features:
The JBL K Potassium Test Set is designed for measuring and doing routine checks of potassium content in
freshwater aquariums within a range of 2 - 15 mg/l (ppm). Salt water has a potassium concentration of around
390 - 400 mg/l, which, however, is only consumed in small amounts. Excessively high potassium concentrations
can endanger sensitive animals such as shrimp.
Why test?
Potassium is one of the macroelements which is absorbed very quickly and effectively within a few hours
and stored temporarily by plants in fresh water. Growing plants require more potassium compared to other
elements. As a result, potassium concentrations can drop to a minimum range, causing plant growth to stagnate,
even if the aquarium water is fertilised regularly (e.g. weekly). Potassium levels in mains water are usually
too low compared to natural biotopes, particularly with regard to calcium and magnesium concentrations. We
recommend daily measurement of the potassium concentrations of your tank water initially. This enables you
to determine the plants' requirements and the corresponding correct dosing of the fertiliser. Afterwards, you
can gradually change over to routine measurements carried out at longer intervals. Values of around 5 to 10
mg/l are generally required for good plant growth. In aquariums with a high rate of illumination of around 1 W/l
illumination intensity and higher, the value should be between 10 and 30 mg/l. Higher potassium values in
aquarium water favour growth of green blanket weed.
Remedial measures for fresh water:
Potassium concentration too low (< 5 mg/l): Fertilisation with JBL Ferropol, JBL ProScape Fe +Microelements
and daily fertilisation with JBL ProScape K Macroelements in particular.
Potassium concentration too high (> 20 mg/l): Repeat the measurement after 24 hours. If the value is still too
high, perform a corresponding water change.
Remedial measures for salt water
We advise against targeted follow-up dosing of potassium in salt water due to its toxicity for diverse organisms.
Regular partial water changes ensure a balanced potassium concentration in a marine aquarium.
Instructions for use of the Potassium Test in fresh water:
1. Rinse the measuring tube and the tube for reading the potassium content with the water to be tested
several times.
2. Use the enclosed syringe to fill the measuring tube with 15 ml of sample water.
3. Add 10 drops of Reagent 1 and mix by agitating.
4. Add 1 large level measuring spoon (broad end of the enclosed double-ended spoon) of Reagent 2 and
agitate gently for approx. 30 seconds until the powder has dissolved. The water turns a whitish, cloudy
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