Sealing sanitary and storm sewer piping is typically more difficult than sealing interior plumbing, mostly because of their construction, and typically because of their size.

Not all fluid systems are designed to carry the same materials through their pipes all the time.

A significant portion of the reason there isn't an even greater number of new technologies in current use in industry is because it isn't always easy for the consuming public to make the connection to the inventor's idea.

The aim of all companies these days is to do more for less.