I had the same problem with one of my toilets. I went to the home improvement store and asked to see a toilet that did had major flushing power. The sales lady showed me a $200.00 model which had a flush assist tank in the back. I was skeptical and thought my wife was going to kill me for spending $200.00 on a toilet, so I told the sales lady that if this toilet didn’t flush like a madman that I would promptly return it. To make a long story short, we love it and now have one upstairs where we just got tired of flushing twice. It is a Crane toilet with a sloan flushmate installed in the back. The sloan flushmate is an enclosed tank that pressurizes when water re enters the tank. When you flush it looses all that pressure down the toilet and in milliseconds you have a fresh clean toilet. Be sure to stand back when you flush. It might scare you a little. Also the flush mechanisms have not had to be repaired at all in two years we have had this toilet. We were a little worried about what to do if something broke in the tank. I hope this helps. Sloan flushmat does have a website somewhere. I purchased the unit as a whole at Lowe’s.