Juwel BioPad Poly Bioflow is the essential mechanical pre-filter pad for the Juwel Bioflow internal filter system, designed to capture coarse particles and suspended debris from aquarium water before it passes through the biological and chemical filter media. By trapping large waste particles early in the filtration process, the BioPad helps prevent the remaining filter media from clogging prematurely, extending their service life and maintaining optimal filtration performance. Supplied in a convenient pack of five, the BioPad Poly is quick and easy to replace and should be changed on a weekly basis to keep the Bioflow filter system running at peak efficiency. Available in Medium (Bioflow 3), Large (Bioflow 6), and XLarge (Bioflow 8) sizes to suit the full range of Juwel Bioflow filter systems.