Highest osmosis rejection ?

[Gildo]

To date: 26 Nov 2019
what is the reverse osmosis membrane with the highest rejection value? 50 or 75 GPD does not matter, I expect maximum rejection!

Thank you all

 

[bluprntguy]

 

[Gildo]

Thanks

 

[JoshH]

Spectrapure Spectraselect 90GPD membranes offer THE best rejection rate on the market. They are rated at 98% rejection rate now but there standard rejection rates are over 99%.

Mine function at around 99.7% and that's a dual membrane setup with around 275ish TDS coming in.

https://www.spectrapure.com/product...s-99-rejection-ro-membrane-90gpd-mem-sp-0090/

 

[Gildo]

Spectrapure Spectraselect 90GPD membranes offer THE best rejection rate on the market. They are rated at 98% rejection rate now but there standard rejection rates are over 99%.

Mine function at around 99.7% and that's a dual membrane setup with around 275ish TDS coming in.

https://www.spectrapure.com/product...s-99-rejection-ro-membrane-90gpd-mem-sp-0090/

I always thought that a membrane of 50, had a better rejection than one of 75, and that going up again the rejection worsened further! why is this even from 90 even better than a filmtec of 50? which I seem to have understood is the one classified with the best rejection?

 

[JS_racer]

I always thought that a membrane of 50, had a better rejection than one of 75, and that going up again the rejection worsened further! why is this even from 90 even better than a filmtec of 50? which I seem to have understood is the one classified with the best rejection?

50 and 75 usually are up to 99% 100 and 150 at 98%
for example https://airwaterice.com/membranes.html

 

[JoshH]

I always thought that a membrane of 50, had a better rejection than one of 75, and that going up again the rejection worsened further! why is this even from 90 even better than a filmtec of 50? which I seem to have understood is the one classified with the best rejection?

That I couldn't tell you, you would have to talk to Spectrapure directly, all I can tell you is mine and others experience with them and that they beat any other membrane on the market at that GPD rating :)

 

[Rjramos]

Not sure but, I would think that a membrane with a rejection rate above 90 gpd would be larger than a 50 or 75 gpd, thus being able to process water through it quicker.

 

[JoshH]

Not sure but, I would think that a membrane with a rejection rate above 90 gpd would be larger than a 50 or 75 gpd, thus being able to process water through it quicker.

Rejection rates are not directly tied to the flow capacity of the membranes (GPD), you can get 100GPD membranes with a 96% rate and ones with 98%, same with smaller membranes, you can get 50GPD membranes with 98% rejection rate and ones with only 96% :) It basically comes down to the quality of the membrane and what it was designed to do. Some are manufactured to a 98% standard and some aren't. Ones that have a higher rejection are more expensive and for things like drinking water, aren't really needed, so they have membranes with slightly lower rejection rates than those designed to actually produce pure water for situations where pure water is needed such as making RODI water as a lower rejection rate means you will be chewing through DI resin much faster.

 

[bratmena]