05-01-2013, 11:02 AM
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Originally Posted by killavixen
straight from the tap, shaken up a bit,
Finally, someone with harder water than me.
That seems an odd combo... a hardness that high HAS to have SOME alkalinity... normally.
Given the symptoms, this is not surprising though. Zero alkalinity would result in zero pH buffering and a drop in the pH is to be expected. Raising the KH without raising the GH might be tricky. I know that using CaCO3 will do that but I don't know of any products that will supply only this... you don't want your GH to go any higher as that is outside of most fish ranges.
Using RO AND Equilibrium sounds like the best bet as you can start with zero KH and GH and bring it up to where you want it by just adding what you need. Byron does this for his extremely soft tap water and it works well for him.