Instruct: Classify the given Amazon review as either positive or negative.
Query: shower water waste control

Solid, Works great! Allows you to throttle the water flow when needed to save the waste. Shuts water off in one direction, reduces to a dribble in the other direction to keep water temp stable. Small enough not to push the head away from the wall too far. Feels solid and rotates firmly but not too stiffly. Got one in both showers - recommended!