 Some air purifiers can lose performance in just six months, and the pricey filter replacements start to pile up. Put an end to the hidden costs with the revolutionary Shark Never Change Air Purifier Max. Cleanable debris defense protects your filters, meaning Never Change won't need a filter replacement for up to five years. Experience ultra-powerful purification, capturing odors, allergens, and more. And with Shark's innovative CleanSense IQ, you can watch as your air improves in real time. The Shark Never Change Air Purifiers.