Ro water with zero KH

[davidwolf]

I have a 120-gallon tank freshwater tank with goldfish. I run a Ro water system and add Seachem Equilibrium on every water change. My tank has a reading of a zero Kh. Some people tell me to put crushed Coral in the filter. Also, look upon the web says Seachem Alkaline Buffer. Does anybody know anything about raising the KH in the water?

[Aiken Drum]

Just add the alkaline buffer to raise KH same as you are adding equilibrium to raise GH.

[rlederer]

I had an RO system but my pH and KH were too low so I ran a drip line into the RO output to inject normal fresh water and let the mixture go into the tank. That way I could adjust the parameters by injecting more or less fresh water with a valve . Never had to use chemicals.