If finished water hardness is one grain per gallon, what action should be taken?

When the finished water hardness measures one grain per gallon (GPG), this indicates a relatively low level of hardness, which is typically acceptable for most drinking water standards. The appropriate response at this level is to monitor the hardness continuously until it rises above one GPG. This proactive approach allows water treatment operators to keep an eye on the water quality and take necessary actions only if the hardness increases, which could indicate a change in source water quality or system performance.

Monitoring instead of immediate action reflects a resource-efficient approach, ensuring that unnecessary chemical adjustments or maintenance operations are not performed when the water quality remains within acceptable limits. This strategy supports optimal management of treatment resources while ensuring compliance with water quality standards.