The Unicel swimming pool filter is made from heavy-duty polyester and is designed to last far longer than cheaper alternatives while having more pleats to improve filtering capacity. Unicel filters are made in the USA for the highest possible quality, allowing you to buy with confidence. Made in the USA!! Top quality, dependable and durable; are a few of the reasons why Unicel leads the industry in swimming pool filter replacement cartridges. Unicel filters use a unique, synthetic fiber filter media specially designed for the pool and spa industry, creating exceptional dirt-catching ability. Easy to clean and easy to replace make Unicel brand filters a great option for your pool or spa.