NDS 1200FFRTL Catch Basin Filter, 12" Prevents dirt and debris from clogging drainage system Removable and easy-to-clean filter can hold up to 40 lbs. without tearing Bypass feature allows water to flow to the catch basin even if the filter is full, is also useful after a heavy storm water event Easy to install and pre-assembled: unscrew the grate, drop the filter in and reinstall the grate Fabric provides superior filtration, resistance to naturally encountered chemicals, alkalis and acids, and protection to biological degradation