If you encounter any after-sales problems when purchasing the products, don't worry, we will give you a satisfactory answer! Description: You can easily adjust the dissolving speed of the chlorine tablets by turning the knob. The Duck Chlorinator can help your pool maintain a chlorine balance. Suitable for swimming pools, spas, etc. Specification: Product Name: Duck Chlorinator Size (approx.): Before expansion: 21 * 9.5 cm / 8.3 * 3.7 inches After expansion: 27 * 9.5 cm / 10.6 * 3.7 inches Material: PVC Packing List: Duck Chlorinator * 1 Note: Due to different lighting and screen settings, the colors of the items may vary slightly from the pictures. Due to the difference in manual measurement, please allow a size difference of 1-2 cm. If you encounter any after-sales problems when purchasing the products, don't worry, we will give you a satisfactory answer!