Did you know that traditional toilet cleaner cages can harbour germs? Duck Fresh Discs have a gel-based formula that self-sticks to the toilet bowl so germy cages aren't something to fret about. Fresh Discs prevent the build up of limescale and stains that harbour germs. Just stick it to the inside rim of the toilet bowl to keep things clean. Pretty easy, huh? 12-count refills compatible with Duck Marine Starter kit - also available in Lavender, Citrus and Raspberry Rainbow. Refill Pack (dispenser not included) Contains 2x Gel holder refills (12 Gel Discs) 4in1 - Fights stains that harbor germs, continuously cleans, fragrances with every flush, lasts up to 7 weeks 1 dispenser lasts up to 7 weeks.