Many shower head flow restrictors are specially designed to deliver a steady flow rate regardless of system pressure changes. The flexible piece relaxes under low pressure, and contracts under higher pressures maintaining a relatively constant flow rate.
By adding a shower flow restrictor to a non-conservative shower head, about 6 to 6.3 gallons/shower head/day, or about 22.75% of the water that the non-conserving shower head would have used could be saved. Remember that shower head flow reduction will also cut down on the amount of hot water used!
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