Im buying my first 3 stage system, what else do i need?

Im buying a 3 stage system with a 30f pole and brush. I also added a TDS meter and 5 replacement prefilters since ill be using it a lot. Do I just need resin and im good to go?

I think the system comes with resin.

In your first post a few days ago about this, I mentioned asking a WCR rep about some of the questions… I hope you are doing that. If you do that and search this forum a little more first, your answers are there.