GPD (Gallons Per Day) vs. LPD (Liters Per Day)

1 US Gallon = 3,78 liter. Often you see these numbers:

  • 050 GPD = 190 LPD
  • 075 GPD = 280 LPD
  • 100 GPD = 380 LPD
  • 125 GPD = 470 LPD
  • 300 GPD = 1.100 LPD
  • 400 GPD = 1.500 LPD

I use intentionally GPD figures. Manufacturers are using GPD, ie. located on the membrane itself. GPD is used in most countries. I urge you to use GPD. I know that many people, especially in Europe, have used and still use liters. But apart from that it's my idea with the abbreviation LPD;-)

The above numbers look fine, but it is wishful thinking without a boosterpump. It is measured at a certain temperature (usually at 25 C) and fairly high water pressure (usually 4-6bar). Realistic is maybe 70% of the above values at 3Bar pressure is measured in PSI and Bar.
1 Bar = 14,5 PSI
click for more info.

But the worst is the fact that lots of dealers totally uncritical indicates these figures. This corresponds to the car dealer would only sell cars by saying: "This car can run 250 km / hour." See also what I have written about water pressure.

A low pressure membrane produces less waster water than other membranes.

TFC means Thin Film Composite.

More about the techn. stuff membrane

purified-healthy-water.comContact • last update: 01 Jul 2017