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>Is there anyway to increase GH without increasing KH at the same time? I 
>wish to keep my KH at its current 5 degrees but I want to increase my GH to 
>about 10dGH, how can I do this without altering my current KH level?
>If I add Sodium Bi-carbonate it will only increase my KH level but if I add 
>Calcium Carbonate it will raise both GH & KH, is there any chemical I could 
>add instead that will only affect GH? Alternatively, is there a way to 
>decrease KH without altering GH?
>The reasoning behind this? Well I originally had my GH & KH levels at about 
>8deg each but I was finding I needed to inject a lot of CO2 to reduce my pH 
>down to around 6.9 - 7.0, roughly about 4 bubbles a second through a Dupla 
>Reaktor 400, and the CO2 concentration was also a little too high for my 
>liking (about 30mg/l).

SeaChem's Equilibrium will add GH but not KH. It's got other good stuff too.
Tom Barr