Effective Filtration: The drain valve is used to filter the air in the filter chamber and the dust and debris at the bottom of the pool, helping to keep the pool water clean and sanitary. High-quality Material: The cartridge pool filter pump is made of high-quality plastic, which is durable, reusable, and guaranteed to last. The lightweight design makes it easy to carry and place where you need it. Wide Range of ApplicationSuitable for pools from 378 liters to 13.24 liters (100-350 gallons). Suitable for 8 to 12-foot pools, as well as 10-foot and 12-foot frame pool models. Equipped with an exhaust valve to exhaust the air trapped in the filter chamber. It is recommended to run the water pump for no more than 8 hours a day. Perfect Combination: Contains everything you need, including a water pump, two grilles, two grille adapters, four fixing rings, four wrenches, one or more filter elements and two corrugated hoses, quick installation design, easy to install, use and replace. How to UseSimply connect the hose to the water pump and the pool valve, and then plug the power cord into the nearest outlet to trap the exhaust valve in the filter chamber.