centrifugal water separators HVAC tower micron water filtration cooling tower sand filter CENTRIFUGAL WATER SEPARATORS Vortisand®‚ is the pioneer in combining centrifugal water separators (Vortex effect) and sand filtration. In fact, it uses a tangential spin across the sand to keep dirt from building up in the unit. Using centrifugal force above the multi-layered media helps to remove the suspended solids and significantly increases the effective filter surface within the tank.