There are fairly simple ways to remove the particulate fraction from the ionic fraction, or the ionic fraction from the particulate fraction (though separating the two fractions without ruining either is more elaborate.)
a) the particulate fraction can be removed from the ionic fraction by freezing and thawing EIS. b) the ionic fraction can be removed from the particulate fraction by graham dialysis. Graham dialysis can be done with a bottle with its bottom cut off (using the string & flame method or a jug cutter), a membrane made of vegetable parchment and distilled water. (Thin cellophane from, say, a pack of cigarettes is supposed to work as a dialyzer membrane too.) The potency of the two species cannot be compared unless one knows the ppm of both. Even then, the surface area of the particulates may have a drastic effect on the outcome of the comparison - not to mention oligodynamism. Graham dialysis was standard practice for purifying colloids when Henry Crookes and many others did their investigations of cs and found it to be about as potent a bactericide as corrosive sublimate of an equal concentration.
