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Do Shower Filters Reduce Water Pressure?
May
Whether a shower filter reduces water pressure depends on what is being measured. Pressure and flow are two different things, and the question usually means flow. Pressure comes from your water supply. Flow is how much water leaves the shower head each minute, and a manufacturer can test and publish it. For Suhae Radiance and Suhae Nourish, that number is 5.0 L/min, from a laboratory report.
Pressure and flow are two different measurements
Pressure is the force the water is under in the pipe, measured in kilopascals or bar. Your supply sets it: the mains, the street, the height of a tank, a pump. Flow is the volume that actually leaves the shower head, measured in litres per minute.
The two are linked, which is why people use the words interchangeably. The same pressure can give a different flow through different shower heads, because the openings the water leaves through decide how much gets out. That is how a shower can feel strong or weak without anyone touching the pressure at the wall.
Where the filter sits in the water’s path
A shower filter sits in the water’s path between the wall and the spray plate. In a Suhae shower filter, the water passes through the cartridge on the way. Ceramic beads and micro fabric catch sediment and pipe debris, and 25,000 mg of vitamin C turns chlorine and chloramine into chloride.
So the route runs from the wall, through the arm or hose, through the cartridge, and out through the spray plate. The figure worth asking about is the flow that leaves the head, in litres per minute.
Suhae Radiance and Nourish, tested at 5.0 L/min
Singapore Laboratory Services tested Radiance and Nourish to AS/NZS 3662:2013 and recorded a mean flow rate of 5.0 L/min (report 22608188-CLC, 19 March 2026). The mean covers five supply pressures, 1.5, 2.5, 3.5, 4.5 and 5.0 bar, measured under clause 5.1 and appendix B of the standard.
Both models use the Aera Flow spray plate, whose fine triangular outlets spread the water into a full, focused spray. The Aera Flow page has the test conditions. Suhae Radiance is AUD $149 and Suhae Nourish is AUD $99.
What to look for on any shower filter’s flow claim
A flow claim is only as useful as the detail behind it. On any shower filter, look for four things:
- A number with a unit. “Strong flow” and “no pressure loss” are descriptions. 5.0 L/min is a measurement.
- The supply pressures it was measured at. A flow figure means little without them.
- The standard the test followed.
- The laboratory and a report number you can ask about.
For Radiance and Nourish, all four are published. If you have a question about your own shower, such as which model suits your bathroom, send a photo to us on WhatsApp at +61 494 015 898. We reply within 24 hours.
Vita Refill is the replacement cartridge for Radiance and Nourish, in ten scents, AUD $29.90. Ask any brand for the same four details and you can compare two shower filters side by side.
