Baked Laterite?

The local fish shop has a new product from Germany that is baked 
laterite. It lookes like gravel and is said to be superior to Duplarit 
for a couple of reasons:

1 - cheaper
2 - can be mixed all through the gravel at the bottom 
3 - doesn't cause clouding when you pull up plants.

Does anyone have experience with it?

BTW - please try to use more informative message headers rather than Re: 
issue 21 when replying to messages. Right now it is not a real problem, 
but when the digest grows to 40-50 messages a volume, it will be a real pain.

Edmund Hack  \  "The great prince issues commands,
echack at crl_com \  Founds states, vests families with fiefs.
Houston, TX      \ Inferior people should not be employed."-regnaD kciN