APTWIN1 High Pressure (10 Bar) Under Counter Filter Box of Aqua Pure With 1" Supply APTWIN1 is a 10" Double Filter Box that can be connected under the kitchen counter. It is connected in series to the cold tap water supply. The cross-section of the filters favors a large supply of water, while their increased resistance to high pressure allows their installation in almost every home. It has a tightening key, and a wall hanging base. It is usually equipped with solids and softening filters to remove dirt, rust and sand and activated carbon filters for basic water dechlorination. Accepts all 10″ replacement filters For their installation it would be good to contact a professional plumber. We remind you that regular maintenance of the filters is also important to prevent the water pressure in your home from dropping.