Filter Media Cup 4"

4-inch Filter Media Cup, NO Support zero waste designed to replace traditional filter socks and accommodate various filter media. Compatible with most round filter sock holders designed for 4" diameter filter socks. Simply drop the Filter Media Cup into your sock holder or filter tray, and fill it with your preferred filter media. For smaller media, use a mesh filter bag.

Choose between two tops: the short top requires glue, while the longer top can be securely fitted through friction.

Six different cups, including 120mm, 180mm, and 240mm lengths, each with options for a large hole (high flow) or a small hole size.