content: The waterpik trs-559 has two water filters inside the attachment to your water line. One is white and the other is black. The manual says you can choose not to install the white one, but pull both of them out. If installed this way I kid you not the handheld is the best handheld shower I have ever used. Without the two filters water flys out the handheld as amazing speed. If installed my way this handheld is worth twice what amazon want you to pay. This product is top of the line better than the 50 60 70 dollar handheld trust me.