Duck 5 In 1 Marine Rim Block, helps prevent limescale, freshens with every flush, cleansing foaming action with a fersh marine scent. Once you place it under your toilet rim, Duck Active Clean turns each and every flush into a foamy fresh rush of bubbles, keeping your toilet clean and fragrant for up to 3 weeks. Each pack of toilet rim cleaner includes 1 Active Clean product. WARNING Irritant. Keep out of reach of children. May produce an allergic reaction. Always read label. Toilet Duck Duck 5 In 1 Marine Rim Block 41g