Whatman Puradisc 25 Nyl PK-1000 0.45UM 6753-2504 Puradisc 25 Nyl PK-1000 0.45UM. 45UM Puradisc 25 Nyl PK-1000 0.45UM is a reliable and dependable addition to the Whatman Filters family of products. Combining top-notch and uncompromising quality with an...