Demineralised water: electrical conductivity smaller than 2 $\mu S / cm$ at 25 °C.
Ultra pure water: electrical conductivity smaller than 0,1 $\mu S / cm$, equivalent with a resistance greater than 0,01 $M\Omega \quad m$ at 25 °C. It is recommended to use water from a water purification system that delivers ultra pure water with a resistance greater than 0,18 $M\Omega \quad m$ (usually expressed as 18,2 $M\Omega \quad cm$).
The recipe for solutions can be found in the recipe book. The following solutions are applicable.
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