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Have you ever seen water run or drip from the shower while you're trying to fill the tub? Plumbers call this "stacking." Pressure balance valves with high flow rates, such as the Grohsafe 35 015 or single function pressure balance GrohFlex, sometimes have "stacking" occur when installed incorrectly.

If this happens on a job, the plumber has one (or more!) of the following problems (listed in order of likelihood):

The plumber calls to say "I have installed a Grohe 35 015 pressure balance valve, and no matter the temperature selected, water is running from the shower! What is wrong, and how can we fix it?" You ask the plumber the following questions:

Apply what you learned: What did the plumber do wrong to cause the water to stack and drip out of the shower?

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