Official Product Description: · A sprout and algae in the water will be killed when the water is under 253.7nm of ultraviolet radiation · Is made of UV proof plastic. · Lid built-in design, do not directly irradiate, will not damage fish · UV clarify the water by reducing the number of free swimming Algae, bacteria, virus, fungi and protozoa. · High productivity, quiet work, easy and better keeping fish Product Note: · Do not light the UV directly to protect your eyes and skin. · Clean the quarter glass tube in a timely manner to maintain good performance. · Install the device on the aquarium wall vertically under water 1.5-5.0 cm depth. Instruction: 1. This equipment can kill harmful germ and algae in the aquarium and pond, which offers a healthy environment for fish 2. When the water is irradiated with a wavelength of 253.7mns of ultraviolet raidation for a short period, the germ and causative agent in the water will then be killed. Attention: 1. Before the water corculation, the electrical source of the UV filter can not be turned on 2. Please put UVC in a stable and safe place. Because the UV light is a tube made of quartz glass, which is easy to be broken. 3. If the UV RADIATION tube or the bodu shell looks like broken, the equipment can not be used. 4. If any person is in the water, UVC can not be used. 5. Please make sure that the electrical voltage, frequency, is used in accordance with the indication of the scatchenon of the UV filter. 6. When installing the equipment, the installation of internal regulation must be observed. 7. Make sure that the maximum pressure of the body shell survived it is less than 0.4 bar. 8. When you know the frost is on, please leave the UV filter. 9. When installing the UV filter, please do not let it under the sun directly. 10. dirt on the quartz tube will affect the effect of the equipment, please clean the aqartz tube in time. 11. in order to provide the effect of equipment, UV light plugs should be replaced after 8000 hours of use.