There's a best for this, a best for that.. looking for natural colors with decent CEC? Try safetsorb, its $4-5 for a 40 lb bag. Black sand, blasting grit $8 for 50 lbs. White sand; definately silica filler, its a little fine grained, however it can look stunning. That again runs about 8 bucks a fifty pound bag.
Then, eco/f max costs between $15 and $20 a bag(20lbs?) Good CEC, but too lightweight. I think it looks nice sprinkled over blasting grit.
Then you get into active substrates, but that's probably not something you normally want to use as a cap.
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