DI add-on ok with a ge water filter? for reef water?

Ok, as most know. I live on well water that runs via GE water softner and via GE smart water filter under my sink.
The link below is the filters it uses.

GE FXSVC water filter and GE SmartWater FXSVC under sink water filters

when I tested my dKH out of my tap through softner and GE smart water filter is 13dkh.
I tested my LFS raw RO/DI water its 0 dkh.
There pre-mix ro/di saltwater is 8dkh.

My question if I add a DI unit after the GE smart water unit, will this lower my hardness and/or TDS? or do I need a whole RO system do that?

The link below is the add-on DI unit I was looking at:
RO/DI Add-Ons


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If I cant just do a DI addon to my existing setup, and have to purchase a RO unit down the road.

do I need RO or RO/DI for reef water. whats the difference?

thanks

 

bump!

 

If you have high tds going into the di then it will get used up very quickly. I would check that before buying a di filter .

 

ok, what about carbonate hardness/dKH ? any thoughts on that?

 

The point of a di IMO is to get the water to 0 tds after an ro so that you are starting with a fresh slate so to speak.

 

dkh does not tell the whole story about your water. Get or borrow a tds tester.

 

could I bring a sample to water plant to test? I think its only $10 bucks or something? that would tell me more info about my water than a tds reading?

 

You can get a tds meter for $20 on ebay. Yes, you will know more about your water quality if you bring it to the lab but you will end up more confused. TDS is simple and easy to understand.

 

I'm not sure what your trying to accomplish. Are you trying to see if its ok to continue using tap?

 

I need a r/o unit. plain and simple. I'll stop trying to fool myself.