Deionized vs distilled water
 

From a price point in the UK deionized is close to £2.50 for 5 litres.
Distilled is £5-7 depending on bulk buy.

Distilled is pure water where deionized still has some minor minerals and bacteria present.

In a pure water setup specifically for cooling only. 50/50 runs too rich and I'm not tuning or wanting more power.

Is there much benefit from either?