[AJ]

How do you flush an RO? and what kind of difference can it make to the system.
Its a 40-40 and the levels have risen dramatically, from 6ppm to 200ppm in a month of replacing the membrane. I have been told that flushing it could sort it out.

Hope smoeone can helps cos its driving me mad.

Cheers guys.

[Alex Gardiner]

Turn the flush valve to the open position and leave running for several hours.  This is the valve that sets your production/waste ratio.  Perhaps your new membrane prefers a higher waste ratio setting.  Ideally you should flush a 4040 membrane for at least 10 minutes before each major fill.

[frames to panes]

Alex, how long for a 300gpd?

[Tim Rose]

fwiw, I do it once a week.  I run for about half an hour.

[Mo]

I do it every day after fill for about half hour
Mo

[Alex Gardiner]

Alex, how long for a 300gpd?

I would recommend about the same, 5-10 minutes before each large fill (1000litres).

[rhys11]

how dose a salt back wash work and is it worth buying one??