RO/DI questions

mojuave

Reefing newb
Ok its time for a new RO/DI filter system and this time I am going to buy one with replaceable media not a disposable cheap one like been using. So my question is that upon looking and researching I have found many different ones and range from 3 stage to 7 stage. Does it make a difference in stages on how many?

I located one that has 3 DI filters and I would think that #2 and #3 would be un needed even useless but I don't have a great understanding on this. Maybe someone could help me here

And if a second RO filter was added does that make a difference (it is an option on others)
 

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