Purifier

Noun

 * 1) A person or device that purifies (by removing impurities)

Thesaurus
abstergent, cathartic, clarifier, cleaner, cleaning agent, cleaning solvent, cleanser, cleansing cream, colander, cold cream, cradle, cream, cribble, dentifrice, depurant, detergent, diuretic, emetic, enema, filter, holystone, lixiviator, lotion, mouthwash, nauseant, percolator, pumice stone, purgative, purge, refiner, refinery, riddle, rinse, rocker, screen, shampoo, sieve, sifter, soap, solvent, strainer, synthetic detergent, tooth powder, toothpaste, wash, winnow, winnowing basket, winnowing fan, winnowing machine

Verb

 * 1) To purify; to cleanse (to cleanse something of impurities)

Etymology
See pur:

Synonyms

 * épurer