Unistar Aquatech Private Limited offers Polypropylene Spun String Wound Filter. Unistar Aquatech Private Limited is an ISO 9001:2000 accredited company supplying a wide range of water treatment & RO plants and allied spare parts. The Polypropylene Spun String Wound Filter is used for filtering a variety of contaminants from water, beverages and other fluids. The Filter comes fabricated with spun polypropylene or fibrillated polypropylene yarn on a polypropylene core and is available in various sizes and specifications.