Low-flow fixtures use higher pressure and much less water. Try replacing your showerheads to WaterSense low-flow showerheads. These showerheads use less than 7.6 litres per minute. They can save up to 60% of water while still holding strong water pressure. Efficient showerheads also reduce hot water use by 15%. This can save you money on your energy bill, too!
You should also shorten your showers to 5 to 7 minutes to limit water waste.