Water Treatment Unit Converter
Flow, pressure, pore size and temperature in one place, using exact definitions - 1 US gallon is 3.785411784 litres, 1 inch is 25,400 microns. Datasheets mix GPD, L/h, m³/h, bar and psi, and a misplaced factor of 24 is the most common error in a filter specification.
Flow rate
Capacity figures on our spec sheets are in L/h. GPD is a 24-hour rating, which is why 100 GPD is only about 15.8 L/h - not 100 L/h.
- L/h
- 15.77
- L/min
- 0.2629
- L/s
- 0.0044
- m³/h
- 0.0158
- m³/day
- 0.3785
- US gpm
- 0.0694
- US gph
- 4.17
- US GPD
- 100.0
- Imperial gpm
- 0.0578
Pressure
Our UF modules are rated for inlet pressure from 0.1 to 0.4 MPa. 0.1 MPa is about 1 bar or 14.5 psi.
- MPa
- 0.2000
- bar
- 2.00
- kPa
- 200.0
- psi
- 29.01
- kg/cm²
- 2.04
- m H₂O
- 20.39
Pore size
Our UF elements are rated 0.01 micron, which is 10 nanometres.
- µm (micron)
- 0.0100
- nm
- 10.00
- mm
- 0.000010
- inch
- 3.9e-7
Temperature
Operating ranges are published in °C. Convert before comparing two datasheets.
77.00
25 C = 77.00 F
Common conversions, worked out
The rows below are generated from the same factors the calculator uses, so they cannot drift apart. Useful when a datasheet quotes one unit and your specification uses another.
| Flow | L/h | L/min | m³/day |
|---|---|---|---|
| 100 GPD (typical small RO) | 15.77 | 0.2629 | 0.3785 |
| 1 US gpm | 227.1 | 3.79 | 5.45 |
| 3,000 L/h (H-1 base grade) | 3,000 | 50.00 | 72.00 |
| 1 m³/h | 1,000 | 16.67 | 24.00 |
| 10 m³/day | 416.7 | 6.94 | 10.00 |
| Pressure | bar | psi | kPa |
|---|---|---|---|
| 0.1 MPa (our minimum inlet) | 1.00 | 14.50 | 100.0 |
| 0.4 MPa (our maximum inlet) | 4.00 | 58.02 | 400.0 |
| 1 bar | 1.00 | 14.50 | 100.0 |
| 60 psi | 4.14 | 60.00 | 413.7 |
| Pore size | nm | mm | inch |
|---|---|---|---|
| 0.01 µm (our UF rating) | 10.00 | 0.000010 | 3.9e-7 |
| 0.1 µm (MF boundary) | 100.0 | 0.00010 | 0.0000039 |
| 1 nm | 1.00 | 0.0000010 | 3.9e-8 |
Why GPD trips people up
A gallon per day figure is a 24-hour rating; gallons per hour is not. Dividing by 24 is the step most often skipped, which makes a 100 GPD unit look ten times bigger than it is.
Bar, psi and MPa
1 bar is 0.1 MPa and about 14.5 psi. Most household installations sit near 0.2-0.4 MPa; our modules need at least 0.1 MPa at the inlet to work on line pressure alone.
Micron and nanometre
One micron is 1,000 nanometres. A 0.01 micron membrane is therefore 10 nm, which is why the same specification appears as both figures on different datasheets.