Hi,
The other alternative is Domolite - the stuff you put on lawns. I must admit that it is a bit strange to put stuff on your lawns in your reef, but this is something reefers did back in the early 90s and late 80s. Its popularity has drop since calcium based sand came out. I have been using it for a while (a year and bit now) and I haven't had any problems with it. There is a thread discussion on Domolite (and other processed materials that weren't meant for reefs) on Canreef.
If you have the cash, then I would get the legit stuff (say, stuff from SWC or Caribsea). The higher price buys you piece of mind.
The other alternative is to go sandless -- not all succesful tanks have DSBs. Nitrate reduction can be done without DSBs.
- Victor.
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