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The size of the pipe you use for your shower depends on the part of the shower you’re installing. Shower drainpipes have a 2-inch diameter, and the water supply lines (both hot and cold) have a ½-inch diameter. You may want to slightly increase the size of the vertical pipe if you have dual showerheads. Check the local building code prior to installation for guidance.

If you don’t replace your shower cartridge, it will eventually fail. As a shower cartridge starts to wear down, your showerhead will leak. This can foster the growth of mold and mildew. It can also corrode the inside of the shower valve. You may start having temperature and water pressure issues with your shower. Luckily, a replacement is relatively straightforward for a pro.

There are three main types of shower valves: pressure-balancing, thermostatic, and diverter. Pressure-balancing and thermostatic valves are both considered mixing valves because they regulate water flow and temperature, but they do so in different ways. A pressure-balancing valve senses changes in water pressure, such as from a flushing toilet, and adjusts the incoming hot and cold water to maintain a consistent temperature; these typically use a single knob. A thermostatic valve uses a thermostat to precisely control the water temperature and requires a separate control to adjust the water volume. A diverter valve directs the flow of water from one fixture to another, such as switching from a tub faucet to a showerhead in a tub-shower combination.

You should replace your showerhead if you notice issues such as low water pressure, leaks, rust, mineral deposits, sediment buildup, or black mold. These signs can indicate internal problems that might lead to health issues if ignored. If you find black mold, it's wise to inspect the rest of your bathroom for other potential sources. Additionally, significant sediment buildup may suggest the need for a water softener, while persistent low water pressure could point to an issue with your water heater.

Even without these problems, replacing an old fixture is an easy and affordable way to upgrade your shower. A new showerhead can offer several benefits, including improved water pressure, better water efficiency, and an enhanced aesthetic that complements your bathroom's style. Modern showerheads also frequently come with extra features like multiple spray settings or a detachable head to improve your showering experience.