What is the term used for clean water types suitable for mixing with concrete?

The term "potable" specifically refers to water that is safe for human consumption and is free from harmful contaminants. In the context of mixing with concrete, potable water is essential because the quality of water used can drastically affect the properties of the concrete, including its strength and durability. Using potable water assures that the concrete mixture will not be compromised by harmful substances that could otherwise arise from non-potable sources, ensuring that the concrete sets properly and maintains its intended characteristics over time.

Other choices like "filtered," "safe," and "clear" may imply cleanliness but do not guarantee the absence of harmful contaminants. Filtered water might still contain substances that affect the concrete's performance. "Safe" is a subjective term, while "clear" refers more to physical appearance rather than quality. Therefore, when dealing with the integrity of concrete work, the term "potable" is the correct and most specific choice.