1. For best results, clean toilet bowl thoroughly. 2. Separate blister from package and take out tablet. Do not remove protective wrap. It is water soluble. 3. Remove lid from toilet tank and flush. When water is low, drop tablet into right corner of tank and away from float assembly. 4. Do not flush for 20 minutes so that tablet can adhere to bottom of tank. 5. When the water is no longer blue, add another Ty-D-Bol Blue Tablet.