rodi weirdness

[fiorano]

So I didn't have a tank running for about a year so and now I have my little biocube up and going. However I just decided to check the tds coming out of the rodi and it is sitting at 10 ppm whereas even the tap water is only 6 ppm. So do you guys think maybe the di membrane had dried out while it was sitting? And if so would I have to replace all the filters or just the di? The crappy thing is that I already have my tank running with clowns and snails lol.