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Seachem Purigen

Does anyone know why seachem purigen claims to "polishes better than a
diatom filter" ? does it refer to some specific aspect of that (removal of
certain ions) or does it refer to water clarity?
how does it work anyway?

ps: would anyone know the weight of a 6ft x 2ft x 2ft tank made of 19mm
glass? + water + a chengal wood stand supported on 8 legs?
would the pressure exceed 150 kg/m2 ?