Sanya Dunn has some unusual advice for first-time visitors to her home: Don't be afraid of the toilet.
"It's kind of loud, and it can scare them," says the 37-year-old homemaker and animal-rescue volunteer in Upland, Calif. "You can't prepare them enough."

Plumber Norm Block of Wynnewood, Pa., has clients who should have heeded those words. A few years ago, they ended up in the emergency room with a visiting elderly aunt after her first trip to the bathroom. She had reached back to flush the toilet before getting up from the stool, he says. Big mistake. "She thought the thing was exploding," Mr. Block says. "
She fell off the toilet and right into the tub," breaking a kneecap.
A new type of toilet is shaking things up in bathrooms across the country. Equipped with something the industry calls "pressure-assisted flushing systems," the toilets use a burst of compressed air to force water through the bowl. Powerful and conservation-minded, they are now in more than 3.5 million homes and offices. They have just one drawback: a startlingly loud flush.