- Best Days
Place a bucket, marked in gallon increments, under your shower head. Turn the shower on at the normal water pressure you use. Time how many seconds it takes to fill the bucket to the one gallon (3.8 liter) mark. If it takes less than 20 seconds to reach the one gallon mark, you could benefit from a low-flow shower head (And then use the water from the test bucket to water plants!)
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