RO water advice needed

Hi
I am interested to get a 5 stage RO without DI filter (both for drinking and aquarium use) to use in my blood parrot aquarium.
I know BPs don't really need RO water, by my tap water is full of nitrates and phosphates.
So need an advice..
is it ok to use RO water and add a mineralizing filter to it? instead of having to add mineral supplements to the tank?
there is also a choice of alkaline filter which seems to do also the job of the mineralizing filter.
apparently these are the minerals output:

Technical Specifications:
Diameter: 53mm
Length: 254mm
Max. flow rate: 250 l/24h
Max. pressure: 6bar
Max. temperature: 51oC
Capacity: 3000 liters
Cations in filtered water:
Ca2+: 55mg/l
Mg2+: 18mg/l
Na+: 22mg/l
K+: 8.5mg/l
Anions in filtered water:
CO32-: 8mg/l
SO42-: 0.2mg/l
Cl-: 0.6mg/l
F-: 0.03mg/l

The question is are these enough ? too much? to little?
the specs of the filter says it would get you to a 7.4 PH as well

Ideally it would the situation where I don't have to mix with tap water or add anything else to the tank.
Thanks in advance

 

Use half ro water half your normal source you'll have all the minerals you need it's what I use in my African cichlid tank

 

Looks like I found some calculator to get the GH out the above!

 

If you check back on this thread just wanted to mention that even with a mineral filter most likely your KH and GH will not be high enough but like mentioned, you can cut in some tap water depending on those nitrate levels you mentioned or put some crushed coral into your filter.

 

Thanks!