The pores in both materials provide bigger surface and nothing else.
The effectiveness of both does not depend on mechanical trapping of particles.
Physico-chemical forces (tiny electric charges) trap the particles. This can be roughly explained by using two magnets - the "+" charged side of one of the magnets attracts the "-" charged side of the other. But two "+" sides push each other away.
Iron for example is charged "+" (Fe2+ or even Fe3+) and if the Purigen beads are charged "+" iron will not be attracted.
The resin (Purigen) is engineered and made in such a way that the physico-chemical forces attract and "keep" only particles with certain electric charges. Resins can be "recharged" because of that - by mixing the resin with some chemical that pulls stronger the same particles that the resin absorbs.
--Nikolay |