Sweet Lu Slim for Twin Cisterns will cleanse, deodorise and disinfect for an average life of three months. For use in Twin Flush Cisterns – Average Life = 3 Months – Safe to use in Septic Tanks. It gives a blue colour to the water while it cleans and deodorises and has a pleasant reodoriser (perfume) which adds a fragrance to each flush. Sweet Lu is made in Australia using biodegradable surfactants and provides a measured dose with each flush. This ensures economic use of the cleaning product. Glass jar and plastic top are recyclable. Sweet Lu is biodegradable above existing Australian Standards and is safe in sewer and septic systems.