I have both in my 75 gallon tank.
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That pic is after washing the substrate for 2 hours and letting a canister filter run for 24 hours. As you can see it's still kinda cloudy. The bags they come in have TONS of dust in them. Make sure you wash the substrate very well before adding it to your tank. You will understand when you try to clean it and it looks like you dumped 3 bottles of brown food coloring in there.
I can't attest for how effective they are as the tank I used them in is only about a week old. I can come back and give updates though. Just don't forget to clean clean clean it before you put it in your tank!
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