ASTM on Data Normalisation
From Desal Wiki
$ \operatorname{Specific Flux} = \frac{Flux \times TCF}{NDP} $
Where: $ \operatorname{TCF} = e^{x} $
$ x = u\left( \frac{1}{T+273} - \frac{1}{298}\right ) $
NDP = Net Driving Pressure
$ NDP = P_{feed}-\Delta \pi-\frac{\Delta P}{n+1}-P_{permeate} $
$ P_{feed} = $ RO feed pressure
$ \Delta \pi = $ Osmotic Pressure
$ \Delta P = $ Feed/Brine Differential Pressure
$ n+1 = $ Number of membrane stages
$ P_{permeate} = $ Permeate back pressure