Water purification unit

A sachet that can remove contaminates from a water sample. The sachet can comprise a nanomaterial. Any suitable amount of nanomaterial can be present in the sachet, for example, 1 %-30% by volume, preferably 1-10% or 2%-5%. In case of antimicrobial composition packed, a preferable quantity to be used in sachet is 2 to 5%. The nanomaterial in the sachet can release, for example, silver, into the water. The described sachet can be immersed in microbial contaminated water and then lifted out of water, such that water in the sachet can drain through the antimicrobial composition packed in the sachet. The composition can release trace quantity of silver ions in the water to be treated. The process of immersion-lift-drain can be repeated, to ensure that entire water volume has contacted the composition. The purification composition can comprise from about 50 vol% to about 99 vol% of the sachet.