ADEY's concentrated system treatment formulas are designed to clean and protect older hydronic heating systems and retrofit installs. MC5 Cleaner and MC40+ De-scaler serve different purposes, but both were created to combat a frequently overlooked enemy of untreated hydronic heating systems – black sludge. The MC40+ Hydronic Heating System Cleaner & De-scaler is designed to restore existing boiler systems by removing lime-scale deposits, calcium and magnetite. The second, MC5 Hydronic RAPIDFLUSH System Cleaner, is an advanced-strength product, designed to work with ADEY’s award-winning MagnaCleanse flushing unit, the company explains.