Plumbing--need your help

[dsaundry]

I don't want to sound too dumb but shouldn't your S/W top up be for F/W?? Or is that for when you do a water change only?

If you are constantly topping with s/w it will look like the dead sea.
I may be blind but on your ato I didnt see the plumbing from what I assume will be a rodi unit..