NDV Ultrasonic is a company that produces its own developed high frequent ultrasonic from the PCB to the finished product tailored to the customer. This is to remove the biofilm without chemicals, but with our own developed HF. ultrasonic. If you no longer want algae, bacteria, lime in your water pipes, swimming pool, spraying installations, warm exchangers, boats, industry of cultivation, etc, and without chemicals, then you should be at NDV Ultrasonic. Make The World Greener For Our Children !