Owned the Zerowater (sold at Target)purifier for three months. Expensive initially and purifiers are twice what others sell for. Touted as cleanest water purifier. Box says purifier should last 2-3 months. Our lasts a month. When purifier needs changing, the water in the pitcher tastes terrible has to be tossed, unlike other purifiers. There is indication mfr puts sometime in the unit to make us change it. YOU CANNOT RETURN IT TO TARGET. Box says call Customer Service but the don't return calls. This product appears to be expensive hype to me. AND, if you return used purifiers to mfr, you pay postage and you get a coupon for $5 off next purchase which barely covers postage. Bottled water is cheaper easier better. A total money suck with no customer service.