Before you get all huffy. A little up-front info from you would help everyone. Talk about the pot calling the Kettle black...The stuff you link to is called Primeagra, not LECA. I can't find a reference to LECA in that link. A better link which turns up immediately is here:
http://www.leca.dk/leca/we/home.nsf...y-about-leca%AE
If you had spelled out what LECA means (lightweight Expanded Clay Granule) and where it is called LECA (Europe), you might have gotten better response...