REMOVE ANY FREE- STANDING WATER ABOVE THE BLOCKED DRAIN. REMOVE DRAIN STRAINER. ADD 2-3 TABLESPOONS 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 MIN. RINSE THOROUGHLY WITH COLD WATER. IF THE DRAIN IS STILL BLOCKED, REPEAT THE PROCESS. IF THE PROBLEM PERSISTS, CONSULT A PLUMBER