Dummy loads es tubes.. Equally, de-ionized water should not be used as the load coolant. De-ionization allows the removal of particles as small as ions from a solution and is used to purify water and remove salts and other impurities. However, since this water is ion-starved, it will chemically attack the brass, copper and aluminum found in the water system and re-deposit some of the metals on the resistor. As a result, the load will overheat and fail rapidly.
Distilled water is water which has been heated to the boiling point so that impurities are separated from the water, which becomes vapor or steam at 212ï F (100ï C). The steam is then cooled and condensed back into pure liquid form. The impurities remain as residue in the steam kettle. This distillation system removes organic and inorganic chemicals, heavy metals, volatile gasses, and other contaminants. Distilled water used as the coolant will yield the maximum life expectancy of the load and is the best solution if water quality is in question. Softened or de-mineralized water is also acceptable due to the lower amount of dissolved solids present