Thank you for all the knowledge I have received here in this Forum :)

[jstdv8]

how high is the TDS going in?
Just your R/O should get you lower than that even without the DI if your filters are good and your membrane isnt used up.

 

[bluering09]

I know for sure the membrane isn't used up because I replaced it some time at the end of the summer. Now that College is over I'm going to take a big deep breath and do a complete run through of my system (that includes cleaning the sand and scrubbing the live rock)