We have a toilet that worked perfectly for years, then suddenly lost its suction power. When you flush, the water comes in through the rim as it's supposed to and some water and waste go down. But it never swirls all the way down taking all the solid waste with it. It takes several flushes to accomplish that wasting tons of water. There's no evidence of a clog; the bowl doesn't overfill. Some folks say I need a new toilet, but what can go wrong with a toilet all of a sudden?