Rigid acrylic filter cup made to fit regular 4″ sock holder, this version has additional vertical flow slots in the sides, these slots in addition to the base venting create an effective open area of 99% across the diameter of the filter cup, meaning max flow can pass through the filter floss.
To ensure a laminar flow through the floss without restricting flow you can either place pelleted form of media in the bottom of the cup or large marbles to keep all the available open space for flow. Having the floss sit on top of this then retains the high flow through the cup,
Use for filter floss / sponges, or a combo of media you choose,
length approximately 8″
Tube Lip diameter 4.25″
Tube diameter 3.75″