Anyone seen this link:

http://www.diy-home-theater-design.com/bass-trap-build.html

What do the pros think? Is sand a good absorber for low frequencies?

(just in case, I tried the search function and it just kept giving me errors, so sorry if this post is redundant).

Yes, this has been asked before and there's no indication that sand will do any kind of absorption.

That's right - don't even waste your time going there.

I have no idea who this guy is - but he doesn't have a clue.

Rod