 we kind of found ultrasound as an option. You're using an ultrasound filtration system. Can you explain that to me? Essentially how it works is you can imagine the ultrasound that's generated creates an acoustic radiation force and more importantly, an area of higher pressure within the steel tube that pushes back microplastics and blocks the microplastics from continuing to flow. So whenever you have water that has microplastics in it, the water will be able to pass through the pipe, but all the microplastics will be blocked