industrial water filters cooling water filtration RO pretreatment INDUSTRIAL WATER FILTERS Our clients receive the highest degree of reliability and satisfaction with our cutting edge technologies. Sonitec has developed and marketed unique industrial water filters for polishing potable, process and wastewater. VORTISAND® industrial water filters are available in a variety of materials and components depending on each application requirements. The standard model is suited for most conditions, and Sonitec manufactures customized systems based on customer's specifications.