Simple to install, just lift cistern lid and place unit inside. Sweet Lu will take 2 to 3 hours to activate, from then on you are assured of a pleasantly clean and sanitised toilet bowl. The only physical effort required is an occasional wipe round with a soft brush. Hard brushes and abrasive cleaners are harmful to the glazed surface of the bowl, so leave the care of your toilet to Sweet Lu. Made in Australia and contains 12 x 200g units per carton. Septic Safe, biodegradable above Australian Standards. Has an average life span of 3 months.