RO Flush

[SuzukiSapper]

Home built 4x40 RO

When flushing with permeate do you flush under pressure or just run it through ?? Thanks

[ecolbeck]

I believe you run under no pressure. The idea is to maximize flow along the membrane surface to "scrub" it of any residual sugars, minerals, and bacteria.

[DRoseum]

That is correct. You want to run with no pressure.
See videos below :
https://youtu.be/MP1NNt3b2Oo
And
https://youtu.be/m_RBNFkq80U

https://www.sugartree.run/2019/03/end-of-season-equipment-cleaning.html

[SuzukiSapper]

Many thanks!!!!!

[maple flats]

Actually there should be some pressure. What you want is for the permeate flow to match the concentrate flow. You balance them by slowly adjusting the restriction and watch both flow meters. If you have no flow meters, just try to get them as equal as you can by just looking at the flow out of the lines. The pressure will change as the membranes get cleaner and it will not be very high. It's really the flow that matters and that is achieved by opening or closing the restrictor valve. When you first start the valve will need to be closed more than after a minute or 2, just adjust as needed. You want the concentrate flow and the permeate flow the same GPM regardless if that is 1 gpm or 100 gpm