Abstract: Process for water purification and for the separation of beneficial materials that are obtained from an aqueous solution, comprising determining a turbidity index and adding to the water or to said solution a composition comprising one or more natural or mixtures of natural substances, chosen from the group consisting of substances having a cationic molecular charge and substances having an anionic molecular charge, in an amount determined as a function of said turbidity index, thereby, allowing water purification and the aggregation of said beneficial materials.

Abstract: An envelope, formed from a transparent sheet, having edges formed with holes whereby a potentially harmful substance contained therein may be withdrawn via at least one of the holes without tearing the envelope. A method for preventing a potentially harmful substance contained within a transparent envelope from harming bystanders involving visually detecting a potentially harmful substance in the envelope, applying a vacuum to the inside of the envelope, whereby the potentially harmful substance contained therein is discharged through holes into a sealable enclosure for inspection and testing, and discarding the envelope together with its contents if the test reveals that the substance is harmful. In another aspect, the method involves irradiating the envelope with radiation whereby to kill any possible pathogens found within the envelope.