Effective Filtration: The drain valve is used to filter the air in the filter room and the dust and debris at the bottom of the pool, which helps keep the pool water source clean and hygienic.High Quality Material: The cartridge pool filters pump is made of high quality plastic, durable, reusable and guaranteed service life. The lightweight design makes it easy to carry and place where needed.Wide ApplicabilitySuitable for swimming pools from 378 L to 13.24 L (100-350 gal). Works with 8 to 12 foot pools, 10 foot and 12 foot frame pool models. Air release valve for air trapped inside the filter chamber. It is recommended to run the pump no more than 8 hours a day.Perfect Combination: Includes everything you need, including a pump, two grates, two grate adapters, four fixing rings, four wrenches, one or more filter elements and two corrugated hoses, quick installation design, easy installation and use and replacement .How to useSimply connect the hose to the pump and pool valve, and then plug the cord into the nearest outlet to trap the air release valve into the filter chamber.