High Efficiency RO/DI Systems

Myka · #1 05-22-2011, 02:19 AM

I still get 0 tds after DI. I'm starting with 120-170 ppm though.

mike31154 · #2 05-22-2011, 02:57 AM

I get 0 after the DI as well no problem year round. Do you measure your TDS after the RO membrane at all? But I guess in the big picture, the difference between 1 & 0 TDS going into the DI stage is probably not worth worrying about.

lastlight · #3 05-22-2011, 03:11 AM

Running a flush so often...aren't you almost running a 1/4" hose nearly unrestricted when doing this? So with all the flushing perhaps the waste ends up being much like it was before. Are you including the flushed water in your calculations Mindy?

Myka · #4 05-22-2011, 05:17 AM

Quote:

Originally Posted by mike31154

I get 0 after the DI as well no problem year round. Do you measure your TDS after the RO membrane at all? But I guess in the big picture, the difference between 1 & 0 TDS going into the DI stage is probably not worth worrying about.

Ya I do, I change the RO membrane when it reaches 10 ppm. Right now it's at 2 ppm.

Quote:

Originally Posted by lastlight

Running a flush so often...aren't you almost running a 1/4" hose nearly unrestricted when doing this? So with all the flushing perhaps the waste ends up being much like it was before. Are you including the flushed water in your calculations Mindy?

Yes. No.

I have thought of this as well. I will measure and time myself flushing tomorrow, and calculate that in as well as proposed waste when using an auto flush. Before installing the 75 gpd restrictor I would manually flush the same as I am doing now so there isn't a change there for me.