GEX Pure Crystal Petit 800mL Antibacterial Activated Carbon Filter Square Type 2 pieces Color: White I used this for about a month after purchasing it, but my pet didn't seem to like it, so I stopped using it. Of the replacement filters, I used one, so there are two remaining. Instruction manual included. Operation confirmed. This is an unwanted item from my parents' house, so I may be slow to respond to detailed questions. Pet Water Dispenser