Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Space-effecient and Brita cartridge compatible

The PUR DS-1800Z is extremely space-efficient especially compared to competitor's water pitchers. Brita makes ridiculous tubby water pitchers that occupy too much room in the fridge while holding much less water. The PUR DS-1800Z is perfectly sized and manages to fit on the top shelf of my undersized refrigerator. Surprisingly, as an added bonus, I was able to use my leftover Brita filters in the DS-1800Z. (The Brita cartridges do not lock into place, but they *are* watertight when inserted.) This product is so highly recommended that I bought another for my immediate family.