cooling water filtration RO pretreatment cooling tower filtering COOLING WATER FILTRATION Even if we became a reference to many, we always innovate and keep looking for ways to improve the quality of cooling water filtration and give our customer greater benefits and simple mode of operation. Sonitec offers unique high-performance cooling water filtration solutions for customers worldwide. Our Service Options (Follow up Program, Long Term Service Contracts or Integrated Filtration Service) allow our customers to make the appropriate choice of equipment and to obtain cooling water filtration solutions that add value to their facilities.