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If one of your measurements reaches the end of the colour chart scale you can multiply the scale by diluting later tests with distilled water (e.g. JBL Dest). Here’s how to do it: dilute the sample with distilled water and carry out the test once more. This works in detail as follows: GH test: Instead of 5 ml use 10 ml aquarium water. Now 1 drop is equivalent to 0.5 dGH. KH test: Instead of 5 ml use 10 ml aquarium water. Now 1 drop is equivalent to 0.5 dGH. Note: when using 10 ml sample water the colour development is weaker with the first drops than with 5 ml sample water. Put the measuring container on a white underlay for a better readability. NH4/NH3 ammonium/ammonia, NO2 nitrite, Fe iron and Cu copper: 2.5 ml sample + 2.5 ml dist. water: result times 2 1 ml sample + 4 ml dist. water: result times 5 0.5 ml sample + 4.5 ml dist. water: result times 10 NO3 nitrate, SiO2 silicate, PO4 phosphate sensitive and Mg magnesium freshwater: 5 ml sample + 5 ml dist. water: result x 2 2 ml sample + 8 ml dist. water: result x 5 1 ml sample + 9 ml dist. water: result x 10 PO4 phosphate koi high range: 2.5 ml sample + 2.5 ml dist. water: result x 2 1 ml sample + 4 ml dist. water: result x 5 K potassium: 7.5 ml sample + 7.5 ml dist. water: result x 2 3 ml sample + 12 ml dist. water: result x 5 1.5 ml sample + 13.5 ml dist. water: result x 10 K potassium in marine water: 1. Fill 10 ml of sample water with distilled water to 300 ml. 2. Follow the instructions for fresh water. 3. Multiply the test result by a factor of 30. CO2 direct, Ca calcium and Mg+Ca magnesium+calcium: not required.
The colour charts are intended to be used with the comparator block. In addition, when the comparator block is used with the blank water sample, this compensates the inherent water colour. Therefore, if the comparator block is not used, there will most likely be deviations in the readings.
With the JBL PROAQUATEST drop tests you have a laboratory comparator system which compensates the inherent colouration of the water and at the same time enables non-chemists to carry out an accurate and safe water analysis. To ensure that water testing monitors the life of your fish and provides the greatest possible safety, you will find an evaluation adaptable to three different applications. Above the different coloured measuring points are numbers, three symbols and a colour band for each. The symbols stand for the following applications: Fish = freshwater Koi = garden pond Starfish = marine water The colour band tells you the meaning of the value determined in green (everything OK), yellow (attention) and red (need for action). In addition you will find numbers that reflect the value in mg/l for the respective colour field. The first two (freshwater and pond) colour bands belong to the upper number row. Marine water belongs to the lower number row. Why do the values differ? Due to the high salt concentration in marine water, the colouring of the reaction is not as intense as in freshwater (which also includes pond). Consequently, the value for the same colouration is greater than in freshwater Why do the recommendations differ? Every habitat reacts differently to certain nutrient concentrations. In the garden pond, for example, constantly changing temperatures and light intensity can jeopardise the value more than in freshwater, where, unlike in the pond, these factors are constant and necessary additives are supplied. That’s why the recommendations are green for one area of application, yet yellow for the other.
Have you lost your record sheets, used them all up, or need them in another language? In the appendix of this FAQ you will find PDF files for printing them out in German, English and French.
The colour cards are not available for download on the JBL website. The absolutely accurate colour reproduction that is required can only be achieved using a printer which can be re-calibrated before each printout. Most privately used printers are not accurate enough for this. You will find the colour chart bundle as a spare part on the respective product page and in the spare parts shop under: https://www.jbl.de/en/products/detail/8732/jbl-proaquatest-assortiment-color-chart
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