I never knew that there are a lot of engineering involve in a toilet until this forum. Anyways when I bought my home 15 years ago I ask the seller to replace the toilet. She put 2 mansfield 160 in the 2 bathroom. This mansfield never work right since the beginning. I have used plungers on this all the time. If I don't want to use a plunger I used a half gallon bleach. My question is one of the toilet is not flushing properly. The water goes down slowly . I have used plunger, bleach, poured a gallon of boiling hot water in it and still have problem. The mechanism looks okay. Can someone tell me whats wrong with it? I have ordered 743 toto drake and its not coming until two weeks. Meanwhile we have guest coming this weekend.