RO/DI water filter and freashwater aquarium

[Aquattro]

Originally Posted by golden69_ca

i use kent and i find im still a little off on my ph . if im topping up the tanks water the straght ro water sends my ph for a loop.

Off topic a bit, but I had pH problems for a while also. I tossed my pH meter and haven't had a problem since!!
When your pH went for a "loop", what exactly happened? went high? Low? Were you measuring the RO water itself? If so, that will be loopy for sure. It's difficult to get a true reading for pH in RO water.
I've been using RO for a couple of years and have never felt that it needed any additional things added.