National Diversified Sales 1200FF 12" White Square Catch Basin Drain Filter blocks more particles from entering and potentially clogging your drain pipes than a drain grate alone as it drains excess stormwater away. The polypropylene geotextile fabric filter comes preassembled on a sturdy polypropylene (PP) frame, treated with UV inhibitors. The filter material is engineered to withstand chemicals, alkalis, and acids. The unique bypass feature allows water to continue to flow through the system even when the filter is full. Hassle-free limited lifetime warranty guarantees the NDS product is free from defects—or we’ll replace it.