You will see a big difference in the water quality too. I have noticed it on my 280 that i had in the past. After switching from RO to DI there was a big change and that was just using it from my topp off.
It took about 3 weeks to convert the tank over from City water/ RO water to Complete RO/DI
You are going to have to wait, but you didnt waste your money.
I'm starting to wonder if I skould have RO DI for my FOWLR....
Or should i just stick on another carbon filter. LOL