Modern showers save water anyway. But for older showers, water-saving showerheads are easy to fit (use a qualified electrician), and could save you on bills.
Do You Need a Water-Saving Showerhead?
Which? magazine suggests this test to see if it’s worth the investment.
Place a 2-litre container on the shower floor. If it takes less than 12 seconds to fill when the shower is running on full, you could benefit from a low-flow shower, which is easily replaced. This aerates the water so it’s a bit like a rain shower, which still gives you a nice shower, but with far less water.
How to Fix a Clogged Showerhead
If your showerhead is clogged with limescale, Mira has a good post on how to fix (and prevent) this using white cleaning vinegar (instructions are different for fixed showerheads). It also has a post on how to fix a dripping showerhead.
This 22-stage shower filter helps to remove chlorine, lead, mercury and pesticides that leach into water from old pipes or the planet, and can lead to dryness, irritation and brittle hair.