The water deionises during the purification process.

The laboratory uses deionised water for experiments.

The laboratory technician deionised the water before conducting the experiment.

I need to deionise the water before using it in the experiment.

The deionisations in the laboratory are used to remove impurities from water.

The deionisation process removes impurities from the water.

The technician is deionising the water to remove impurities.