The answer to 'pressure regulator rusty water' is that a rusty pressure regulator is often caused by mineral buildup, corrosion, or a failing diaphragm. Symptoms include low water pressure, discolored water, and leaks. The solution may involve cleaning, replacing the regulator, or adjusting the pressure settings. However, this is generally a job for a professional plumber, as pressure regulators require specialized tools and expertise to service properly.
Attempting to fix a pressure regulator yourself can be dangerous if you don't have the right skills and equipment. It's best to call a licensed plumber to diagnose and repair the issue to avoid further damage or safety hazards.