It got me thinking about this Sani-Seal product and sought out some reviews...Here is one...."If the gap between the bottom of the toilet and the toilet drain flange on the floor is small, these seals are not a very good option. The foam rubber compresses only so far, and the toilet will end up resting on the seal, rather than around the edge of the toilet base, no matter how much you push down. Gaps that are too small happen when the plumbers are careless with the flange/drain installation and put the flange up on top of the finish floor, or don't put the bottom of the flange tight down to the sub-floor. In these cases, you need to redo the plumbing, or use a regular wax seal. Because of the design of the sani seal, it's easy enough to test fit the seal first and switch to a wax seal if you need to." The object of the ball game is to use the wax ring as a seal...not as a coupling...and although the Sani-Seal may work on some installations...for how long is the question. I'll stick to wax...I hate callbacks!! There is no money in them and definitely not good for my customer reviews...amongst themselves!!
The only part of this guy's review I do not agree with is..."...when the plumbers are careless with the flange/drain installation and put the flange up on top of the finish floor..." Indeed...the toilet flange is supposed to be installed 'on top' of the finished floor...Most of the problems with toilet flange leaks is because most flanges are either installed incorrectly to begin with or bathroom floors have been remodeled and the flange is then at a different height...That's why I prefer to use a product like Set-Rite which bring the toilet flange back to where it is supposed to be....and it is code approved...which I prefer...