Toilet Cleaner & Descaler 1 Litre toilet duck is an easy to use, macerator and septic tank safe toilet cleaning solution. Our formula is phosphoric acid based, which safely cleans & descales without the need for harsh bleach. Our toilet cleaner can be used for general toilet cleaning in any toilet, as well as descaling and maintaining saniflo macerator systems. The bleach-free solution breaks down scale build up and dirt, without harming macerator seals and natural septic tank bacteria. Use around the toilet bowl for everyday, general cleaning. Or for macerator descaling, disconnect the macerator unit from the electric supply. Pour 1-2.5 Litres into the toilet bowl. Turn on the macerator unit again for a few seconds to allow the descaler to enter the system. Turn the macerator off and leave to work for up to 2 hours. Leave overnight for very heavy scale build up. After descaling, reconnect the power supply and flush the toilet to rinse. For hard water areas descale monthly. For soft water areas descale every 3 months.