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Re: [APD] Calcium Carbonate question



Calcium carbonate will only raise the GH if it dissolves in the  
water.  (Isn't that profound?)  So, if you dump in a tsp of it and it  
just settles in the substrate to dissolve very slowly as it tends to  
do, the GH wont change at all.

Vaughn H.

On Jul 28, 2006, at 2:52 PM, Jerry Baker wrote:

> Stuart Halliday wrote:
>> I've recently added a small quantity of this powder to my 25 litre  
>> planted
>> aquarium in order to raise the GH above zero. (I live in a soft  
>> water area).
>>
>> Aquarium water is KH high and ph is around 7.5.
>> (I added some sodium bicarbonate a few days ago.)
>>
>> However after leaving the water to clear for 3 hours, I tested  
>> again and
>> still the GH is zero.
>>
>> Am I doing something wrong?
>
> 1/4 teaspoon or so should raise your GH by around 2 degrees in a 25
> liter tank. If your test kit doesn't reflect this, then it may be the
> problem.
>
> -- 
> Jerry Baker
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> Aquatic-Plants at actwin_com
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