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I would check it first...

put some in a container of water and let it sit ot use muriatic acid to check it. Dh uses some black blasting grit at work and I had him bring some home for me to check when I was setting up the 75. I really wanted a black substrate but could not afford Eco Complete. It raised the ph so high overnight that my kit would not even read it. I know there is some black blasting grit that has been used before but I cannot remember the name. Just looking at the ingredients and not being a scientist, engingeer, ot any other degreed title (unless you count domestic engineer, transportation director, and handymom) I would think the aluminum might be a problem.
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