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RO water/Tap water

I have been using RO water for over a year because of the poor water quality
here in Waco, Texas. I have been adding Kents RO Right, Dupla KH-Bilder and
Duplagan to bring my KH to about 4 or 5. I have been considering adding Waco
tap water instead to bring my KH to 4 to 6. I am not a chemist and I don't
know how much tap water to add to the RO water. Here is the water analysis
that I received from my water treatment plant.

Constituent Name                       Result
Total hardness as CaCO3            179 mg/l
Ph                                                 7.5
Tot. Alka as CaCO3                     154  mg/l
Bicarbonate                                  188 mg/l
Carbonate                                     232 mg/l
Nitrate   (as N)                              1.46 mg/l
I  would appreciate any help that someone can give. I would like to know how
many gallons of tap water I should add to bring  water up to a KH of 4 or 5
and a reasonable total hardness to match. I have lurked on this group for
quite awhile and have benefited by owning a beautiful planted aquarium.
Daniel Hawley