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Latest Issue of Aquarium World Magazine.

Where to get Calcium

peet
in Aquatic Plants

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I have just run out of my CaCO3 that I've had for years. I am pretty sure when I got it last time it was plaster of paris, but I went to Bunnings on the weekend and the bags they had there were Calcium sulphate (thyo.. something or other). Is this the right stuff.... where to do others buy their calcium??

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    Plaster of paris is calcium sulphate. That is usually the recommended calcium source to boost GH for aquatic plants.

    Bunnings is fine, or a hydroponics place.

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    Hi Jen, thanks for that, I've done a bit more research it Tom Barrs website confirms that COSO4 is the cheapest and most easily available form of calcium and it appears that it dissolved much more easily than CaCO2... I think the plaster of paris is 2CaSO4.H2O. Great, Bunnings stop on the way to work tomorrow.

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