I was in the market for a new shower head so I went to Lowes. I learned that the average shower head flow is 2.5 gallons per minute. You can get them with lower flow rates but 2.5 GPM is the standard. I have a 1.75 GMP showerhead on order from some website. I wonder if the reduced flow will be noticeable. All this because our water bill shot up.. later I found that they had under-charged me on the previous bill.