The Blueair 503 home air purifier is more than very economical, more than highly functional, and more than ultra stylish. It’s all those things, but it’s more than the sum of its parts. This Blueair air purifier has fewer filter stages than many competing models. Fortunately, because of its materials, design, and ability to pump tons of air, it doesn’t seem to need them. Tons of clean air very quick and all the time is proof of that.