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There is no universal replace-by date for a standard, unfiltered shower head. Keep it while cleaning and simple service restore normal spray and sealing. Replace it when the housing or inlet is cracked, a body seam or swivel keeps leaking, an internal control has failed, corrosion or contamination remains inside, or performance stays poor after you have ruled out the hose, valve and water supply. A filter cartridge has its own schedule and is not the same thing as the shower head.

Compare the shower with nearby fixtures, measure its flow, then test a handheld shower with the head removed from the hose. Strong hose flow but weak head flow means the restriction is in the head. Weak hose flow sends the investigation upstream to the hose, outlet, mixing valve, hot-water system or building supply. A high-pressure shower head can reshape the spray; it cannot create supply pressure that is not there.

An eight-minute shower uses 16 gallons at 2.0 gpm or 20 gallons at 2.5 gpm. In metric units, that is about 60.6 or 75.7 liters. Use the calculator below with your measured flow—not a generic average—for a result that applies to your bathroom.