CaribSea's Response
I received an e-mail from them the same day I sent in my question. Unfortunately, I forgot about the SPAM blocker at work...
We have a few typos that we have been trying to correct and you have stumbled upon one of them. Neither of these substrates perform best in DSB applications because you would need to use much much more of it as it is more coarse than traditional DSB substrates.
Jud McCracken
CaribSea, Inc.
772-828-2315
So there you have it!