Mirabowl QC is a concentrated lavatory bowl cleaner and deodorizer that has been specifically designed for flush tank treatment of all types. Mirabowl QC will not attack aluminum surfaces, while simultaneously cleaning pump systems keeping O-rings from cracking. Mirabowl is effective, strong, pleasantly scented and safe to use. It prevents sludge buildup in pump system - thereby minimizing pump failure rate. For deep cleaning maintenance on lavatory pump system, soak entire pump for 12 to 24 hours then flush with steam or high pressure water.