The DAC Power Active Chlorine Toilet Rim Block Set provides hygiene and freshness that lasts. This DAC Power Active rim block set is an ideal solution to maintain the hygiene in your toilet. It keeps your toilet clean and fresh for a long time. It helps eliminate unpleasant odors. Effective results. Whenever you flush the toilet, these blocks will exude fresh smell and maintain the cleanliness of the bowl. How to use: Unfold hanger and place onto toilet bowl rim. Adjust to ensure products is in the flow of the water when the toilet is flushed.