Do my water tests still work although they have been open for nine months?
Basically a sealed test keeps longer than an open one. How much the shelf life is reduced depends crucially on the handling and the storage conditions of the reagents. It may happen that a reagent in a test that has been open for 9 months doesn’t indicate correctly any more. However, additional information is needed to answer this question properly.
What is the shelf life of the JBL CO₂ Permanent Test ?
The JBL CO₂ permanent test has a shelf life of 3 years in the original sealed bottle.
The following is printed on the bottom of the packaging:
CH/B: 2413 (e.g.) = batch number
BBD: 09/13 (e.g.) = best-before date (month/year)
Please note that the best-before date does not apply for opened reagents. Exposure to atmospheric oxygen decreases the shelf life.
The reagent in the JBL CO₂/pH Permanent Test decolourises after a few days.
It is very likely that a bacterial biofilm has formed in the container. Please place the reaction vessel in hot water (> 40 °C) for approx. 10 minutes. In order to do so, it must be taken apart and then put together again afterwards. Please do not use boiling water, as this may cause damage to the plastic.
Aren’t these two statements about the JBL CO2/pH-Permanent test contradictory ?
The special indicator shows the CO2 level independently from substances in the water, such as humic acids or nitrate, which influence the pH value.
The pH permanent test only works when no substances, such as pH-Minus or peat, which influence the pH values, are added.
No, the two statements do not contradict each other.
The indicator reacts to the pH value of the test liquid. The indicator in the JBL CO2/pH-Permanent test only changes colour because of the carbon dioxide which has diffused from the water into the test liquid.
Humic acids or other acids have a pH-reducing effect. As a result the real pH value in the aquarium water can be lower than that shown in the indicator, which is only influenced by the diffused carbon dioxide inside the water.
Is the drop count of 35 correct for JBL Test-Set CO₂/pH-Permanent ?
Yes, the drop count is correct. This is the reason why two bottles of indicator solution are included with the test. With the new JBL Test-Set CO₂/pH-Permanent the indicator solution is no longer prepared in the aquarium water. The indicator is adjusted to a fixed carbonate hardness so that incorrect measurements (as when humic acids enter the aquarium water) no longer occur.