Dear Nomundari, I am not ...

Dear Nomundari,

I am not sure if you are Nomundari I know from the univesity in Vienna ? The term backwashing can lead to misinterpreatations, becuase it would implement to wash against the forward direction ( which is feed to permeate). Never wash from the permeate side to the feed side. The possibility to wash from the outlet (concentrate side) to the inlet side but only on the feed-conncentrate side, is always possible and has the  advantage, that brine seals (V-Chevron seals) flap in and there will be some flow between membrane element and pressure housing, which is normal a very stagnant area (a 8" membrane shows a stagnant volume of around half a  liter)- if heavy biofilming- Billions of bacteria are in this area and even during disinfection-sanitisation, stay as they are. If you are the Noumndari I know, send me an e-mail: walter.lintner@usf-water.com. Kind regards Walter