This is a sale of a 20 pack of 30 Inch extended life, REUSABLE higher quality Sentiment filters made by Filtercor of California. These are polyester, not lesser quality woven fiber or polyproplyne cartridges. Description: The chemical and bacteria resistance of the Series PE polyester. Media makes these cartridges suitable for potable water, most light. Industrial applications, swimming pool and spa, and well water ap. The durable, non-woven polyester fabric is reusable, while. Being pleated to maximize its dirt holding capacity and extending the. Time period between changes. Country of Origin: USA. Diameter: 2.75 Inch (standard 2 5/8). Non-Woven Polyester Fabric Media. Vinyl Plastisol End Caps. 40ºF (4.4ºC) to 125ºF (52ºC).