I recommend the Toto Drake ADA CST744SL toilet.
Terry Love

: : I have a 3.5 gpf toilet that I feel I need to replace with an ADA height elongated type. I am afraid I will encounter flushing problems and am seeking to offset them with either a pressure assist or vacuum assist toilet. The problem is I cannot determine which type is most efficient and trouble free. My home is almost 50 yrs old and about every 2 years I have to get the sewer rodded out because of tree roots. I need a forceful flush to not aggravate the problem.

: You have a misconception about these toilets. The power of the flush is to get the stuff through the toilet trap and into the main drainage line. The velocity of the flush is not going to carry all the way out to the street.
: I also find the noise of these toilets real objectionable. Look into a regular Toto. You will spend a little more, but as you are already apparently aware, it is not always cheaper to buy the least expensive toilet out there.
: Deb
: The Pipewench

• Toto Drake toilet