Petmate Replendish Automatic Gravity Waterer

I bought the 4 gallon waterer for my elderly friend, who has 2 dogs and 3 cats. She doesn't remember to fill their water dish, and I don't have time to go there every day and do it for her. I chose this model because it's easy to clean after you take it apart. As other reviewers have said, it's a major chore to fill, because 4 gallons of water is over 30 lb. The water container is *very* slippery when wet, and there's no handle to grab it by. And there's no way to shut off the water flow, so you have to get the water container into/out of the base quickly. I recommend that you put this waterer on a water-safe surface like concrete, or else buy a silicone mat to catch the inevitable spills. Having said all this, I still think this waterer was the best choice and I would buy it again. The best fill technique I've found is to set the water container on the floor, right next to the base, upside down, and pour in water from gallon jugs. Then I put on rubber gloves, get down on my knees, grab the water container and flip it onto the base. Once it's on the base, rotate it until it locks.