What water should I use to prepare the buffer concentrates?

We recommend using highly pure water for reconstitution. Ultrapure water (such as the one from MilliQ system, also known as type 1 water) with a resistivity of 18.2 MΩ-cm at 25°C can be used. In case you do not have access to type 1 water, QIAGEN offers Nuclease-Free Water (5 L, cat. No. 129117); and Nuclease-Free Water (1000 mL, cat. No. 129115). It is important that you do not use tap water as this may interfere with the extraction of the target analyte.