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In most cases, you can remove your showerhead without turning off your main water supply. You just need to make sure your shower isn’t on before you screw off the showerhead. That said, you may experience a small trickle of leftover water in the pipe. 

If you have an older showerhead, it may be a good idea to turn off the main water supply because this job can put pressure on the pipes. If you have a shower shut-off valve, it will be hidden somewhere in a nearby access panel.

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.

You can install a shower pan liner over plywood using the steps outlined above. However, before pouring the mortar pre-slope or installing a premanufactured slope product, check the condition of the plywood. The subfloor should be stable, level, and free of rot or other damage. You’ll need to repair damaged sections before pouring the mortar.

Most modern showers have a prefabricated base made from fiberglass or plastic, such as acrylic or polyurethane. Nonetheless, concrete mortar is still the traditional, go-to base for a custom walk-in shower.

You’ll need to add a waterproofing liner or membrane between the layers of mortar to keep moisture out. From there, you can top it with whatever type of tile you like to create a spa-like custom look. Be sure to include these considerations in your budget for the cost of a walk-in shower.