Different labs have different lab water requirements.
Generally, lab water comes in three different purities. ASTM Type III is the least pure, and is suitable for processes such as filling water baths or for use in autoclaves. Type II is the next step up, recommended for general lab processes, such as preparing media and certain reagents. Type I is the most pure, and is required for sensitive analytical processes, such as HPLC, GC, or MS.
Our lab water warriors describe some of the purification techniques, requirements, and applications of each type of lab water in this new Lab Manager infographic.