Filtration is a purifying agent.    From Wordnet, Princeton University. 

Verb (used with object) : to purify metals. ,to purify a language.    From Dictionary.com. 

Bothe asked Fleischmann to switch projects and begin purifying isotopes.    From Wordnik.com.  [Walther Bothe and the Physics Institute: the Early Years of Nuclear Physics] Reference

Some research suggests that: some house plants are efficient in purifying indoor air.    From Wordnik.com.  [Archive 2006-08-01] Reference

Maybe there is something to that old saying about pain purifying, but I would not prescribe the treatment.    From Wordnik.com.  [Moe, Thomas N.] Reference

The other black figure holds a cigar to the head of the captive in what Ms. Danien describes as a purifying ritual.    From Wordnik.com.  [Maya Pottery and Politics] Reference

Hitler claimed that he was bringing in the new age by "purifying" the German race.    From Wordnik.com.  [Gangaji: Where Does Torture Start? Where Does It End?] Reference

They're still ignoring the fact that mostly EMHCs are "purifying" vessels after Mass.    From Wordnik.com.  [URGENT The "Reform of the Reform" is in motion] Reference

The republicans need to stop about talking about "purifying" the party.    From Wordnik.com.  [Cafferty File] Reference

And so I come, secondly, to note the purifying which is needed prior to such love.    From Wordnik.com.  [Expositions of Holy Scripture Second Corinthians, Galatians, and Philippians Chapters I to End. Colossians, Thessalonians, and First Timothy.] Reference

The GOP has begun the necessary process of 'purifying' itself from the unreliable far right.    From Wordnik.com.  [The Strata-Sphere] Reference

Owners of the Leaf - the name is meant to reflect the "purifying" function of leaves in nature.    From Wordnik.com.  [Top Stories: BreakingNews.ie] Reference

They are gone now, as much a relic as Brylcreem, which makes "purifying" the party an ever more extreme proposition.    From Wordnik.com.  [Las Vegas Sun Stories: All Sun Headlines] Reference

"purifying" Umno, PAS would end up being just as corrupt as Umno.    From Wordnik.com.  [Rojak and Cocktail] Reference

"purifying" the public service, the security forces and the judiciary so they could not be manipulated by politicians.    From Wordnik.com.  [ANC Daily News Briefing] Reference

"purifying" the public service, the security forces and the judiciary so that they could not be manipulated by politicians.    From Wordnik.com.  [ANC Daily News Briefing] Reference

That is, the feast of the purifying or cleansing of the temple.    From Wordnik.com.  [The Bible, Douay-Rheims, Book 46: 2 Machabees The Challoner Revision] Reference

Again, we notice that Peter says, "purifying their hearts by faith.".    From Wordnik.com.  [When the Holy Ghost is Come] Reference

Janet Craig: The popular shrub is known for its air-purifying ability.    From Wordnik.com.  [PLANTS THAT PURIFY] Reference

Grossman's novel, even more than his prose so far, has a purifying effect.    From Wordnik.com.  [Carlo Strenger: David Grossman -- Guide for the Perplexed] Reference

And put no difference between us and them, purifying their hearts by faith.    From Wordnik.com.  [The Bible, Douay-Rheims, Book 51: Acts The Challoner Revision] Reference

"All ready!" ordered Ned as he shut of the valve of the cooling and purifying box.    From Wordnik.com.  [The Air Ship Boys : Or, the Quest of the Aztec Treasure] Reference

Maybe detecting room temp and humidity, measuring dust concentrations and purifying the air.    From Wordnik.com.  [KEEP IT SIMPLE, PLEASE!] Reference

And I think they got a lot out of it: a purifying of their soul through a visual recreation.    From Wordnik.com.  [Helping Rwanda to Weep] Reference

It is a splendid spring medicine, cleansing the blood and purifying and toning up the system.    From Wordnik.com.  [The Ladies Book of Useful Information Compiled from many sources] Reference

They are famous not so much for originality, as for their calm, spiritual, purifying messages.    From Wordnik.com.  [The True Citizen, How to Become One] Reference

Time and again he has exhorted Catholics to embrace life as a series of purifying crucifixions.    From Wordnik.com.  [Next, A Tougher Stand On Birth Control] Reference

If you can, that sacred memory will be a purifying, ennobling influence for you all your life long.    From Wordnik.com.  [Love's Final Victory] Reference

In the same manner, all music which has the power of purifying the soul affords a harmless pleasure to man.    From Wordnik.com.  [Politics: A Treatise on Government] Reference

The Turks, the Bulgars, the Germans, the Greeks were all busily purifying the ethnic composition of their lands.    From Wordnik.com.  [Terrorists and Freedom Fighters] Reference

Executives from Proctor & Gamble frequent Wisconsin's Sundara Inn & Spa, where they can treat themselves to a "purifying bath ritual.".    From Wordnik.com.  [FORGET GYM. IT'S NOW 'SPA.'] Reference