Advice sought on using an RO unit

I bought an DD Aquarium solutions RUV050 RO unit at the weekend, if I had
known how bad the instructions were I might
have not bothered,

Eventually I worked out that you needed to put a flow resistor on the
output pipe but what's not clear from the unit is
what is filtered out and what's not.

I know I have to replace minerals and have bought some Kent supplies to do
so, what I don't know is whether I am still
meant to treat the water before putting it in my tanks.

Has anyone used one of these and if so can they provide advice, its a
conventional Twin pod (carbon and sediment
filters), TFC membrane (link here for picture
http://www.aquatics-online.co.uk/
listsections.asp?parent=81&seq=129#product522)

Regards

Brian


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