RO/DI Membrane - Pentair High Efficiency

[tutmatt3]

Hey guys!

I figured this would be a chemistry question, so posting here.
I'm picking up a BRS 5-stage RO/DI unit from a local, who happened to replace the membrane w/ a 1:1 Pentair GRO-75EN membrane
http://waterpurification.pentair.co...ownload/en/4002874-pentair-gro-rev-c-ja16.pdf

My question is there are any complications using this for reef use? I couldn't find a reason against it, but also didn't find any posts on the forums of people using them.

It appears to use a TLC membrane, and BRS/Spectrapure use TFC (thin film vs thin layer).
As said, can't see a reason it would cause any harm, but would love any input!

My city using chlorine & chloromine, so I'm replacing one of the carbon stages on the 5-stage for a chloroplus filter. So the set up will be:
1) 1 Micron Sediment
2) Chloroplus
3) Carbon
4) Membrane
6) DI

Thanks!

 

[Randy Holmes-Farley Verified Community Expert]

I can't see a reason it would be a problem.

 

[tutmatt3]

Thanks Randy!

 

[tutmatt3]

I can't see a reason it would be a problem.

One more question:

Does the process benefit from any duplicates of filters? EX Dual carbon, dual sediment, dual DI

Obviously each duplicate will help prolong the filters of the stages to come after, but does it make sense to use any dupes - or would it be wiser to wait until that stage begins to weaken, and replace w/ a brand new

 

[Randy Holmes-Farley Verified Community Expert]

The best one to duplicate, IMO, is the DI. That way, you can run it to depletion and still have good water. Then swap in a new one in last place and move that one to the second to last place.

 

[tutmatt3]

The best one to duplicate, IMO, is the DI. That way, you can run it to depletion and still have good water. Then swap in a new one in last place and move that one to the second to last place.

Thank you once again!

 

[Buckeye Hydro Verified Sponsor]

Hey guys!
http://waterpurification.pentair.co...ownload/en/4002874-pentair-gro-rev-c-ja16.pdf

These membrane caught our eye when they were introduced some time back. The reasons we haven't started using these:
*low (96%) rejection rates if used in an RODI system
*high (65 psi) pressure requirements
*the membranes are encapsulated - so you have to buy an RO membrane housing every time you buy a membrane
*they are expensive

You'll also note that these membranes are spec'ed for softened water... That is, water with less than 17 ppm (1 gpg) of total hardness. Well, if you don't use softened water with these membranes, and go for a 50% recovery with the flows typical in a residential scale system, guess where you are likely to see scaling?

If the 50% recovery is critical to you I'd stick with softened water and a Filmtec membrane spec'ed at 50 psi.

Russ