Frequently Asked Questions
Here we list questions we are regularly asked.
If you have other questions, please feel free to contact us.
Frequently Asked Questions
- What is DPD and what is it used for?
- DPD stands for N,N-Diethyl-p-Phenylene Diamine, and is used primarily to determine Chlorine. The DPD reacts with Chlorine to produce a pink/red colour which goes proportionally darker as the concentration increases. However, DPD is NOT specific to Chlorine as it react with other Oxidising agents such as Bromine, Hydrogen Peroxide etc.
- What are the different types of DPD reagents used for?
- Total residual Chlorine - DPD No.3, (or No.s 1 and 3) Free and Combined Chlorine - DPD No’s 1 and 3 Free Chlorine, monochloramine, Dichloramine - DPD No’s 1,2 and 3 Chlorine Dioxide - DPD No.1 , DPD Glycine (only in the presence of Chlorine) Free Bromine - DPD No.1, DPD Glycine (only in the presence of Chlorine) Ozone - DPD No.4 (or No’s 1 and 3) In addition : DPD Glycine tablets are used to convert Chlorine to Chloramines which do not react with DPD No.1 DPD Nitrite tablets are used to counter act free Bromine
- Can I use other DPD tests to measure other oxidising agents using set factors?
- Multiply the Chlorine reading by 3.6 to read in mg/l Iodine Chlorine multiplied by 1.9 expresses the result as mg/L Chlorine Dioxide
- Dipslides
- Dipslides are easy to perform bacteriological tests which give an estimation of the general bacteria population (if using TVC –Total viable count). Using these enables that water system operator or Engineer to asses the general quality of the water in respect of microbiological species.
- Is there a Dipslide for determination of Legionella?
- No, the determination of Legionella bacteria requires laboratory conditions and is a test that takes between 7-10 days.
- What is the different between the units used ppm and mg/L?
- When dealing with water, there is no difference. They are the same unit expressed differently. Ppm = Parts per million Mg/L = Milligrams per Litre
- How do I convert µS (micro siemens) to ppm (TDS – total dissolved solids)?
- µS x 0.7 = TDS This is a good estimation – the factor is actually varies dependent to types of dissolved solids present in the water.
- Do Aquaklar® do any other tests, different to that shown in the catalogue?
- Yes, the range offered in the catalogue and website is a fairly comprehensive list of the most commonly requested tests, but there are many more tests and methods available from AquaKlar.
Specialized services
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Support center
For technical support on any Aquaklar® product, please contact us at;
+ 61 3 9416 8300Telephone:
mail@aquaklar.comEmail: