Related: [[./how milliq water systems produce pure, laboratory grade water|how milliq water systems produce pure, laboratory grade water]]
Summary Ultrapure, DI water, RO, distilled water, and double distilled quick comparison. I’ve personally worked with Ultrapure, DI-water, and distilled water.
Water purity comparison (source) ![[./what kind of water to use for equipments-1.png|what kind of water to use for equipments-1.png]]
MilliQ water (de-ionized water) will leach metal ions from equipment, and will cause the metal to corrode much quicker.
For things like waterbaths and incubators, use autoclaved tap water or autoclaved Type 2 water.
On reddit someone mentioned having used 50/50 of tap water and DI water without any issue.