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[APD] Calcium Carbonate question

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?

Stuart Halliday
Aquatic-Plants mailing list
Aquatic-Plants at actwin_com