Function: The portable filter brush can quickly clean the dirt inside the filter element. And the rotary knob is convenient for users to adjust the water volume. This spa and hot tub filter cleaning tool is the ultimate maintenance accessory. Extends the life of swimming pool or hot tub filters and equipment. Dimensions: The portable pool cleaning brush measures only 22 x 10 x 5, compact and lightweight, easy to carry and does not take up much space. Adjustable: The pool filter brush fits standard garden hoses and can be connected to the water hose. And there is a rotary knob to adjust the water flow size. Convenient: Our pool filter cleaner can easily remove debris and dirt, so that you have a clean water flow. Removes debris from the filter in seconds. Designed to be compatible with most standard hot tub, spa and pool filters (excluding filters).