BioGuard Strip Kwik is an effective degreaser that unclogs your sand, cartridge and DE filter, restoring it to optimal efficiency. Its patented formula quickly cuts through the thickest oil, grease, dirt, and other contaminant buildup on your filter elements to greatly extend its lifespan, saving you money over the course of the pool season. Strip Kwik also is able to clean your filter in about an hour instead of overnight soaking like its competitors.