Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Flimsy, poorly engineered, unreliable

I have had three of these units fail in 8 months. All because of cracks that developed in the thin, plastic housing. None of the failures can be attributed to abuse or rough handling. Evidently, the units are not capable of handling normal, household water pressure. PUR is sending a 4th unit as a warranty replacement, but I was told that it would be the last time they would provide a warranty replacement.This is clearly a product where even a one-star rating is overly generous.