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As from wiki - Potassium carbonate (K2CO3) A known food additive. This adds carbonate without raising pH. The potassium is a bonus if you have a planted aquarium.

I've never tried that myself though. I use an African style additive - baking soda, table salt, epsom salt
 
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As from wiki - Potassium carbonate (K2CO3) A known food additive. This adds carbonate without raising pH. The potassium is a bonus if you have a planted aquarium.

I've never tried that myself though. I use an African style additive - baking soda, table salt, epsom salt
That will raise the pH (actually... it'll do it much more so than baking soda. Carbonate is a stronger base than bicarbonate).

Unfortunately you can't adjust KH without impacting pH; it's just the way the carbonate buffer system works. Although there are some cheats sometimes. What are you trying to achieve?
 

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Discussion Starter · #6 ·
Hi Everybody,

For some strange reason, Steve's reply reminded me of CO2/ Matrix dosing which I used to do long ago when I had the energy and time. At that time my kH was never a problem. So I am trying a little bit of Matrix but haven't tested yet. Will let you know.

April, I always thought Equilibrium was for general hardness only - not so?

Aquaddict
 

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Discussion Starter · #7 ·
Hi Again,

Oops, sorry folks. I meant Metricide, not Matrix. Sorry about that.

I still have a 1/2 bottle of Metricide so, 10 ml in 92 gal tank raised the kH from 1 to 4. No increase in pH.

AquaAddict
 
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