JBL TestLab Handbuch Seite 34

5. Move the comparator block together with the jars backwards and forwards on the colour chart, until the
colour of the sample treated with reagent matches the colour under the blank sample as closely as possible.
6. Read the pH level in the notch of the comparator.
The instructions are repeated in a series of simple diagrams on the reverse of the colour chart.
Our tip for environmentally-friendly users:
All reagents for JBL test sets are available from your retailer as reasonably-priced refill packs!
pH TestSet 7.4 – 9.0
Special features:
The JBL pH Test Set 7.4 - 9.0 can be used for exact measurements and routine monitoring of the pH level in
saltwater and slightly alkaline freshwater, as required by fish from Lake Malawi, as well as for koi and other
garden pond fish for example. Using the compensation method specially developed by JBL, precise and reliable
results can be obtained even in moderately discoloured water, e.g. during the treatment of diseases.
Why test pH levels?
The well-being of all water organisms depends to a large extend on the pH level being kept as constant as
possible. In particular, sudden fluctuations should be avoided.
A pH level of 8.2 is considered best for marine organisms. In marine aquariums with invertebrates, the
consumption of calcium bicarbonate (carbonate hardness) can lead to a drop in pH levels if a regular supply is
not ensured. The carbonate hardness and the pH level serve as indicators.
In garden ponds the assimilation activity of green floating algae (also known as water bloom or green water)
may drastically reduce carbonate hardness (calcium bicarbonate), dangerously increasing pH levels.
For the care of fish from slightly alkaline waters, such as Lake Malawi and Lake Tanganyika, this test enables
the pH level required by any particular species to be precisely monitored. Levels of 8-8.5 are generally
recommended. For more detailed information please refer to specialist literature.
For koi and other garden pond fish levels between 7 and 8.5 are considered most beneficial.
Note: High levels of nitrate reduce pH levels in fresh and salt water! Appropriate steps should be taken to keep
the nitrate content as low as possible, e.g. regular partial changes of water!
Remedy in case of pH fluctuations:
Reducing pH levels:
Freshwater aquariums: When necessary, add CO
only) JBL pH-Minus.
In garden ponds: Increase carbonate hardness and stabilise pH levels by adding JBL StabiloPond KH. As a
long-term care measure to stabilize the carbonate hardness we recommend the regular use of StabiloPond
Basis.
Increasing pH levels:
Marine aquarium: In saltwater stocked with fish only, add JBL pH-plus; for invertebrates, add JBL CalciuMarin
or install a standard calcium reactor.
Freshwater aquarium: Add JBL pH-Plus or JBL AquaDur plus.
Garden pond (koi pond): An increase of pH is generally not required.
Instructions:
1. Repeatedly rinse both test jars with the water to be tested.
2. Use the enclosed syringe to fill each of the test jars with 5 ml of sample water.
3. Add 3 drops of 7.4 - 9.0 reagent to one of the test jars and mix by shaking.
4. Place both test jars into the comparator block: the jar with added reagent into the smooth end of the comparator
block, the jar with the untreated test water (blank sample) into the notched end of the comparator block.
5. Move the comparator block together with the jars backwards and forwards on the colour chart, until the
colour of the sample treated with reagent matches the colour under the blank sample as closely as possible.
6. Read the pH-value in the notch of the comparator.
Our tip for the environmentally-friendly users:
All reagents for JBL test sets are available from your retailer as reasonably-priced refill packs!
using the JBL PROFLORA CO
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system or (for freshwater
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UK