1. Function: The portable filter brush can quickly clean the dirt inside the filter element. The rotary knob allows users to easily adjust the water volume. This spa and hot tub filter cleaning tool is a useful maintenance accessory that can extend the life of pool or hot tub filters and equipment. 2. Dimensions: The portable pool cleaning brush measures only 22 x 10 x 5 cm. It is compact and lightweight, easy to carry and doesn't take up much space. 3. Adjustable: The pool filter brush is compatible with standard garden hoses and can be connected to the water hose. There is also a rotary knob to adjust the water flow rate. 4. Convenient: The pool filter cleaner can easily remove debris and dirt, enabling the water to flow freely. It can remove debris from the filter in seconds. It is designed to be compatible with most standard hot tub, spa and pool filters (except some filters). 5. Description: It fits standard garden hoses. It has an ergonomic handle and plastic teeth for deep cleaning between filter pleats. It can extend the life of your pool and spa filter. 6. Features: - Material: PVC. - Color: blue and black. - Dimensions (L x W x H): approx. 7 x 2 x 23 cm. 7. Contents: 1 filter cleaning brush.