POWERFUL FOR KITCHEN SINKS & BATHROOM DRAINS. EMPTY THE ENTIRE PACKET INTO THE DRAIN (DO NOT USE MORE THAN INDICATED) IMMEDIATELY POUR ½ LITRE OF WARM WATER (NOT BOILING INTO THE DRAIN. IF WATER BOILS OUT OF THE DRAIN, ADD ANOTHER CUP OF WATER. WAIT 15 MINUTES. RINSE THOROUGHLY WITH COLD WATER. IF THE DRAIN IS STILL BLOCKED, REPEAT THE PROCESS. IF THE PROBLEM PERSISTS, CONSULT A PLUMBER.