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BryceM · 04-15-2009, 04:55 PM

CaCO3 can be used but as Ray pointed out, you really need to use a fine talc-like power to get it to dissolve in a reasonable amount of time. Those people who do use it usually dose in the evening so it doesn't cloud up their tank during the day.

Most people who are looking to raise KH do it with NaHCO3 (baking soda) which is readily soluble in water. The sodium half of the molecule isn't exactly desirable, but at the concentrations we use, it isn't that big of a deal.

04-15-2009, 04:55 PM	#5 (permalink)
BryceM Administrator Join Date: Nov 2005 Location: South Central Idaho, USA Posts: 4,262 iTrader Ratings: 42 iTrader Positive Rating: 100% Plant Points: 178534	Re: CaCO3 for alk CaCO3 can be used but as Ray pointed out, you really need to use a fine talc-like power to get it to dissolve in a reasonable amount of time. Those people who do use it usually dose in the evening so it doesn't cloud up their tank during the day. Most people who are looking to raise KH do it with NaHCO3 (baking soda) which is readily soluble in water. The sodium half of the molecule isn't exactly desirable, but at the concentrations we use, it isn't that big of a deal.