its advice
you dont know what your doing, you have no experience of what your doing.yet your going to tackle it in someones house and charge them for it
i wasnt being flippant just for the crac of it,
someone can give you all the info you want but ts diferent reading it on here as to puting it in practice.
Ime assuming this stuff is expanded clay balls, ive used loads of it in Spain mostly for ligtweight concrete on refurbs, great stuff and has many uses its called Arlita in Spain made by Maxit have a look at the website