PSI RO Membrane rejection

[oval291]

I need clarity on this. Does a higher PSI decrease RO membrane rejection due to less contact time with the membrane. Is 50 to 60 PSI the optimum range to have 98 % rejection?

And another related question does the lower PSI affect waste to product ratio?

 

[mcgyvr]

If pressure is low the rejection rate can be below the membranes specified value.
Most membranes need 50-60+ psi to perform at their stated rate..An increase beyond that doesnt guarantee the membrane will perform even better

 

[windlasher]

If pressure is low the rejection rate can be below the membranes specified value.
Most membranes need 50-60+ psi to perform at their stated rate..An increase beyond that doesnt guarantee the membrane will perform even better

THIS: And temperature. Most work best at around 90 degrees.

 

[outssider]

Most work best at around 90 degrees.

I've noticed my ro/di puts out much more product water in the summer than winter. it's in the garage and the tap water here gets warm in the summer but not 90 degrees....maybe 80 though....

 

[Vinny Kreyling]

Cold water affects flow through the membrane significantly.
DO NOT use hot water it will kill the membrane.
Most are specked out around 77 degrees IIRC.

 

[clevername]

https://www.bulkreefsupply.com/vide...r-psi-for-reverse-osmosis-system-performance/

give yous all the info.

50-60 PSI doesnt get you that 98% rejection rate. If you read the spec sheets on the RO membrane they test with MUCH higher pressure.