Thanks for your interest ncc212.
Yes, actually the ballast crete is a commercial registered product and it is not the only one with that characteristics in the market. By other means a could contact two or three companies specialized in this slurry ballast and so I think the question I did is already answered.
Anyway, it would be very kind of you to post the information you have on this companies (the links) so i can see if there is someone i didn´t know of.
Thanks for all in advance and happy christmas for all of you.
Vicente Rodriguez