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Supplement C......hardener?

2K views 1 reply 1 participant last post by  Robnjo 
#1 ·
What is that supplement(white powder) that starts with a C and and it a type of Hardener?.....calcium or carbonate...or...?
Its added for corals and Live rock....i think
 
#2 ·
...Carbonate Hardness Generator, thats what I was trying to say.
so what does it exactly do?
 
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