DAC Rimblock Air Freshener Technology ensures that the bathroom is flooded with a fresh aroma for an extended period of time. DAC ensures an air freshening impact in your bathroom with a 4-function composition (cleaning foam, anti-limescale, dirt protection, and extra freshness). Fresh and Clean Toilets: From the first flush to the last, your toilet will be clean and fresh. Simple to Use: Simply hang the rimblock under the rim of the toilet where there is a strong water flow. Discrete Design: The DAC rimblock's discrete design is suitable for any toilet.