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Having the right low-flow showerhead can reduce the amount of water you use while taking a shower by 30 percent. There are a number of options in showerheads and they range in price from $10-$30. How do you know if your showerhead uses too much water? Old showerheads deliver four to five gallons per minute; however, newer regulations set the maximum water flow rates at 2.5 gallons per minute. To see if your showerhead is using too much water you need a bucket (marked with lines showing one gallon, etc.), stopwatch and food coloring to help you see the water. Just place a few drips of food coloring into the bucket. Take your showerhead and set the stopwatch when you turn the water on. If, after 20 seconds, you have more than 1 gallon of water in the bucket, you need to replace your showerhead.