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Re: WHY Calcium carbonate as KH buffer
Chris Coleman writes:
> I buffer GH and KH with sodium bicarbonate (NaHCO3) for KH and
> calcium chloride (NaCl) for GH.
Calcium Chloride is CaCl
> Is there a reason why the CO2 posts here frequently make reference to
> calcium carbonate (CaCO3) as a KH buffer? Is there any benefit to using
> calcium carbonate over calcium chloride?
Using CaCO3, you can increase both GH and KH at once. Why use two things when
you can kill two burds with one stone?
> I prefer my current method simply because the calcium chloride effects =
> without effecting GH. and because it dissolves very rapidly with water.
I think you have that backwards. The calcium chloride will increase general
hardness (total hardness) without increasing alkalinity.
Carbonate is a buffer and is therefore useful for stabilizing pH. CO2 tends
to cause pH swings in planted tanks in keeping with the light/dark cycle. As
to whether cabonate will help control these carbonic acid pH swings, I will
let someone more experienced give an answer.