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Originally Posted by TheReefGeek
Interesting.
What is the purpose of the rock salt?
How are you going to lower the Ph of the cement?
You didn't use any aragonite sand at all?
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The rock salt creates holes in the concrete giving it light weight and ?porosity?
I didn't use the sand cause I didn't like the looks of it. Right now the "rocks" are still very grey but will lighten up in time. I will post a picture of one of the pieces tonight.
As far as the ph goes, concrete once cured (6 - 8 weeks) will lose its high ph content. You just soak it in fresh water with water changes every day or 2.