The Premier pet fountain holds 60 ounces of water. The submersible pump circulates the water through two filtration systems to remove dirt and hair and to remove bad taste and odor. Cleaning the fountain and replacing both filters at least once a month is recommended. The plastic design is BPA free and comes apart for easy cleaning. It is dishwasher safe except for the actual pump. It continuously moves water which helps prevent bacteria growth and keeps the fountain cleaner than a regular water bowl. It also encourages your pet to drink more.